JEE Main & Advanced Physics Photo Electric Effect, X- Rays & Matter Waves Question Bank

done X Rays Total Questions - 111

• question_answer1)
  An X-ray tube is operated at 50 kV. The minimum wavelength produced is                                           [CPMT 1996]
  A)
             0.5 Å                                         done clear
  B)
             0.75 Å done clear
  C)
             0.25 Å                                       done clear
  D)
             1 Å done clear
  View Solution play_arrow

• question_answer2)
  Which of the following wavelength falls in X-ray region [CPMT 1975; MP PMT 1984]
  A)
             10000 Å                                   done clear
  B)
             1000 Å done clear
  C)
             1 Å done clear
  D)
             10?2 Å done clear
  View Solution play_arrow

• question_answer3)
  A metal block is exposed to beams of X-ray of different wavelength. X-rays of which wavelength penetrate most [NCERT 1980; JIPMER 2002]
  A)
             2 Å                                             done clear
  B)
             4 Å done clear
  C)
             6 Å done clear
  D)
             8 Å done clear
  View Solution play_arrow

• question_answer4)
  X-rays and gamma rays are both electromagnetic waves. Which of the following statements is true         [NCERT 1973]
  A)
             In general X-rays have larger wavelength than of gamma rays done clear
  B)
             X-rays have smaller wavelength than that of gamma rays done clear
  C)
             Gamma rays have smaller frequency than that of X-rays done clear
  D)
             Wavelength and frequency of X-rays are both larger than that of gamma rays done clear
  View Solution play_arrow

• question_answer5)
  In producing X-rays a beam of electrons accelerated by a potential difference V is made to strike a metal target. For what value of V, X-rays will have the lowest wavelength of 0.3094 Å         [CPMT 1982; NCERT 1986, 87]
  A)
             10 kV                                        done clear
  B)
             20 kV done clear
  C)
             30 kV                                        done clear
  D)
             40 Kv done clear
  View Solution play_arrow

• question_answer6)
  In  radio theraphy, X-rays are used to   [CPMT 1972; BHU 2005]
  A)
             Detect bone fractures done clear
  B)
             Treat cancer by controlled exposure done clear
  C)
             Detect heart diseases done clear
  D)
             Detect fault in radio receiving circuits done clear
  View Solution play_arrow

• question_answer7)
  Hydrogen atom does not emit X-rays because [NCERT 1979; CPMT 1980, 90; RPET 1999]
  A)
             Its energy levels are too close to each other done clear
  B)
             Its energy levels are too apart done clear
  C)
             It is too small in size done clear
  D)
             It has a single electron done clear
  View Solution play_arrow

• question_answer8)
  X-rays were discovered by                     [NCERT 1977; BHU 2005]
  A)
             Becquerel                              done clear
  B)
             Roentgen done clear
  C)
             Marie Curie                           done clear
  D)
             Von Laue done clear
  View Solution play_arrow

• question_answer9)
  X-rays are [CPMT 1975; EAMCET 1995; RPET 2000; SCRA 1994]
  A)
             Stream of electrons done clear
  B)
             Stream of positively charged particles done clear
  C)
             Electromagnetic radiations of high frequency done clear
  D)
             Stream of uncharged particles done clear
  View Solution play_arrow

• question_answer10)
  The voltage applied across an X-rays tube is nearly [CPMT 1983]
  A)
             10 V                                          done clear
  B)
             100 V done clear
  C)
             10000 V                                   done clear
  D)
             106 V done clear
  View Solution play_arrow

• question_answer11)
  The characteristic X-ray radiation is emitted, when [CPMT 1975, 80, 90; RPET 1999]
  A)
             The electrons are accelerated to a fixed energy done clear
  B)
             The source of electrons emits a monoenergetic beam done clear
  C)
             The bombarding electrons knock out electrons from  the inner shell of the target atoms and one of the outer electrons falls into this vacancy done clear
  D)
             The valence electrons in the target atoms are removed as a result of the collision done clear
  View Solution play_arrow

• question_answer12)
  Molybdenum is used as a target element for production of X-rays because it is [CPMT 1980; RPET 1999]
  A)
             A heavy element and can easily absorb high velocity electrons done clear
  B)
             A heavy element with a high melting point done clear
  C)
             An element having high thermal conductivity done clear
  D)
             Heavy and can easily deflect electrons done clear
  View Solution play_arrow

• question_answer13)
  Mosley's law relates the frequencies of line X-rays with the following characteristics of the target element [CPMT 1980; NCERT 1985]
  A)
             Its density                              done clear
  B)
             Its atomic weight done clear
  C)
             Its atomic number              done clear
  D)
             Interplaner spacing of the atomic planes done clear
  View Solution play_arrow

• question_answer14)
  Compton effect is associated with                         [CPMT 1971]
  A)
             \[\alpha -\]rays                    done clear
  B)
             \[\beta -\]rays done clear
  C)
             X-rays                                      done clear
  D)
             Positive rays done clear
  View Solution play_arrow

• question_answer15)
  X-rays are in nature similar to
  A)
             Beta rays                                done clear
  B)
             Gamma rays done clear
  C)
             de-Broglie waves                done clear
  D)
             Cathode rays done clear
  View Solution play_arrow

• question_answer16)
  If the cathode?anode potential difference in an X-ray tube be 105 V, then the maximum energy of X-ray photon can be
  A)
             105 J                                          done clear
  B)
             105 MeV done clear
  C)
             10?1 MeV                                done clear
  D)
             105 KeV done clear
  View Solution play_arrow

• question_answer17)
  The shortest wavelength of X-rays emitted from an X-ray tube depends on the  [MP PMT 1987; CPMT 1988, 92; IIT 1982]
  A)
             Current in the tube            done clear
  B)
             Voltage applied to the tube done clear
  C)
             Nature of gas in the tube done clear
  D)
             Atomic number of target material done clear
  View Solution play_arrow

• question_answer18)
  The wavelength of X-rays is of the order of  [CPMT 1983; MP PMT 1987; KCET 1994; JIPMER 1997]
  A)
             Centimetre                             done clear
  B)
             Micron (10-6 m) done clear
  C)
             Angstrom (10-10 m)            done clear
  D)
             Metre done clear
  View Solution play_arrow

• question_answer19)
  X ? rays and \[\gamma -\]rays of the same energies may be distinguished by                                     [CPMT 1985]
  A)
             Their velocity                        done clear
  B)
             Their ionising power done clear
  C)
             Their intensity                      done clear
  D)
             Method of production done clear
  View Solution play_arrow

• question_answer20)
  When a beam of accelerated electrons hits a target, a continuous X-ray spectrum is emitted from the target. Which of the following wavelength is absent in the X-ray spectrum, if the X-ray tube is operating at 40,000 volts [MP PMT 1993; NCERT 1984; MNR 1995; RPMT 2002]
  A)
             0.25 Å                                       done clear
  B)
             0.5 Å done clear
  C)
             1.5 Å                                         done clear
  D)
             1.0 Å done clear
  View Solution play_arrow

• question_answer21)
  For continuous X-rays produced wavelength is
  A)
             Inversely proportional to the energy of the electrons hitting the target done clear
  B)
             Inversely proportional to the intensity of the electron beam done clear
  C)
             Proportional to intensity of the electron beam done clear
  D)
             Proportional to target temperature done clear
  View Solution play_arrow

• question_answer22)
  An X-ray has a wavelength of 0.010 Å. Its momentum is [AFMC 1980; RPMT 1995; Pb. PMT 2004]
  A)
             2.126 \[\times \]10?23 kg-m/sec                                        done clear
  B)
             6.626 \[\times \]10-22 kg-m/sec done clear
  C)
             3.456 \[\times \] 20?25 kg-m/sec                                       done clear
  D)
             3.313 \[\times \]10?22 kg-m/sec done clear
  View Solution play_arrow

• question_answer23)
  X-rays are not used for radar purpose because
  A)
             They are not reflected by the target done clear
  B)
             They are not electromagnetic waves done clear
  C)
             They are completely absorbed by the air done clear
  D)
             They sometimes damage the target done clear
  View Solution play_arrow

• question_answer24)
  A direct X-ray photograph of the intestines is not generally taken by the radiologists because  [CPMT 1986, 88]
  A)
             Intestines would burst on exposure to X-rays done clear
  B)
             The X-rays would not pass through the intestines done clear
  C)
             The X-rays will pass through the intestines without causing a good shadow for any useful diagnosis done clear
  D)
             A very small exposure of X-rays causes cancer in the intestines done clear
  View Solution play_arrow

• question_answer25)
  The patient is asked to drink \[BaS{{O}_{4}}\]for examining the stomach by X-rays because X-rays are
  A)
             Reflected by heavy atoms done clear
  B)
             Refracted by heavy atoms done clear
  C)
             Less absorbed by heavy atoms done clear
  D)
             More absorbed by heavy atoms done clear
  View Solution play_arrow

• question_answer26)
  X-rays can be used to study crystal structure, if the wavelength lies in the range
  A)
             2 Å to 0.1 Å                            done clear
  B)
             10 Å to 5 Å done clear
  C)
             50 Å to 10 Å                           done clear
  D)
             100 Å to 50 Å done clear
  View Solution play_arrow

• question_answer27)
  When the accelerating voltage applied on the electrons increased beyond a critical value                              [CPMT 1975]
  A)
             Only the intensity of the various wavelengths is increased done clear
  B)
             Only the wavelength of characteristic relation is affected done clear
  C)
             The spectrum of white radiation is unaffected done clear
  D)
             The intensities of characteristic lines relative to the white spectrum are increased but there is no change in their wavelength done clear
  View Solution play_arrow

• question_answer28)
  The X-ray beam coming from an X-ray tube will be   [IIT 1985; SCRA 1996; MP PET 1999]
  A)
             Monochromatic                   done clear
  B)
             Having all wavelengths smaller than a certain maximum wavelength done clear
  C)
             Having all wavelengths larger than a certain minimum wavelength done clear
  D)
             Having all wavelengths lying between a minimum and a maximum wavelength done clear
  View Solution play_arrow

• question_answer29)
  The continuous X-rays spectrum produced by an X-ray machine at constant voltage has                [DPMT 1999]
  A)
             A maximum wavelength  done clear
  B)
             A minimum wavelength done clear
  C)
             A single wavelength          done clear
  D)
             A minimum frequency done clear
  View Solution play_arrow

• question_answer30)
  The penetrating power of  X-rays increases with the [MP PMT 1984]
  A)
             Increase in its velocity       done clear
  B)
                   Increase in its frequency done clear
  C)
             Increase in its intensity     done clear
  D)
             Decrease in its velocity done clear
  View Solution play_arrow

• question_answer31)
  If \[{{\lambda }_{1}}\] and \[{{\lambda }_{2}}\] are the wavelengths of characteristic X-rays and gamma rays respectively, then the relation between them is                                               [MP PMT 1987]
  A)
             \[{{\lambda }_{1}}=\frac{1}{{{\lambda }_{2}}}\]        done clear
  B)
             \[{{\lambda }_{1}}={{\lambda }_{2}}\] done clear
  C)
             \[{{\lambda }_{1}}>{{\lambda }_{2}}\]                           done clear
  D)
             \[{{\lambda }_{1}}<{{\lambda }_{2}}\] done clear
  View Solution play_arrow

• question_answer32)
  The wavelength \[\lambda \] of the \[{{K}_{\alpha }}\] line of characteristic X-ray spectra varies with atomic number approximatel [MP PMT 1987]
  A)
             \[\lambda \propto Z\]      done clear
  B)
             \[\lambda \propto \sqrt{Z}\] done clear
  C)
             \[\lambda \propto \frac{1}{{{Z}^{2}}}\]                        done clear
  D)
             \[\lambda \propto \frac{1}{\sqrt{Z}}\] done clear
  View Solution play_arrow

• question_answer33)
  The minimum frequency \[\nu \] of continuous X-rays is related to the applied potential difference V as
  A)
             \[\nu \propto \sqrt{V}\]  done clear
  B)
             \[\nu \propto V\] done clear
  C)
             \[\nu \propto {{V}^{3/2}}\]    done clear
  D)
             \[\nu \propto {{V}^{2}}\] done clear
  View Solution play_arrow

• question_answer34)
  If V be the accelerating voltage, then the maximum frequency of continuous X-rays is given by [NCERT 1971; CPMT 1991;                                                 MP PET 2000; RPMT 2001; MP PMT 2002]
  A)
             \[\frac{eh}{V}\]                   done clear
  B)
             \[\frac{hV}{e}\] done clear
  C)
             \[\frac{eV}{h}\]                   done clear
  D)
             \[\frac{h}{eV}\] done clear
  View Solution play_arrow

• question_answer35)
  The minimum wavelength of X-rays produced by electrons accelerated by a potential difference of volts is equal to [CPMT 1986, 88, 91; RPMT 1997; RPMT 1997, 98; MP PET 1997, 98; MP PMT 1996, 98, 2003; UPSEAT 2005]
  A)
             \[\frac{eV}{hc}\]                 done clear
  B)
             \[\frac{eh}{cV}\] done clear
  C)
             \[\frac{hc}{eV}\]                 done clear
  D)
             \[\frac{cV}{eh}\] done clear
  View Solution play_arrow

• question_answer36)
  The potential difference applied to an X-ray tube is increased. As a result, in the emitted radiation [IIT 1988; ISM Dhanbad 1994; AIIMS 1997; MP PMT 1995, 2004]
  A)
             The intensity increases done clear
  B)
             The minimum wavelength increases done clear
  C)
             The intensity decreases done clear
  D)
             The minimum wavelength decreases done clear
  View Solution play_arrow

• question_answer37)
  A potential difference of 42,000 volts is used in an X-ray tube to accelerate electrons. The maximum frequency of the X?radiations produced is                                       [MP PMT 1993]
  A)
             \[{{10}^{19}}\,\,Hz\]          done clear
  B)
             \[{{10}^{18}}\,\,\,Hz\] done clear
  C)
             \[{{10}^{16}}\,\,Hz\]          done clear
  D)
             \[{{10}^{20}}\,\,Hz\] \[(1\,eV=1.6\times {{10}^{-19}}J\] and \[h=6.63\times {{10}^{-34}}J-\sec )\] done clear
  View Solution play_arrow

• question_answer38)
  Which of the following is accompanied by the characteristic X-ray emission                                          [MP PET 1993]
  A)
             \[\alpha -\]particle emission  done clear
  B)
             Electron emission done clear
  C)
             Positron emission               done clear
  D)
             K?electron capture done clear
  View Solution play_arrow

• question_answer39)
  X-rays are known to be electromagnetic radiations. Therefore the X-ray photon has                       [MP PET 1993]
  A)
             Electric charge                      done clear
  B)
             Magnetic moment done clear
  C)
             Both electric charge and magnetic moment done clear
  D)
             Neither electric charge nor magnetic moment done clear
  View Solution play_arrow

• question_answer40)
  X-rays of which of the following wavelengths are hardest 
  A)
             4 Å done clear
  B)
             1 Å done clear
  C)
             0.1 Å                                         done clear
  D)
             2 Å done clear
  View Solution play_arrow

• question_answer41)
  X-ray beam can be deflected by       [CPMT 2000; BHU 2001; Pb. PMT 2002]
  A)
             Magnetic field                      done clear
  B)
             Electric field done clear
  C)
             Both (a) and (b)                   done clear
  D)
             None of these done clear
  View Solution play_arrow

• question_answer42)
  X-rays are produced due to                [CPMT 1985; JIPMER 2002]
  A)
             Break up of molecules      done clear
  B)
             Changing in atomic energy level done clear
  C)
             Changing in nuclear energy level done clear
  D)
             Radioactive disintegration done clear
  View Solution play_arrow

• question_answer43)
  X-rays region lies between                                       [CPMT 1990]
  A)
             Short radiowave and visible region done clear
  B)
             Visible and ultraviolet region done clear
  C)
             Gamma rays and ultraviolet region done clear
  D)
             Short radiowave and long radiowave done clear
  View Solution play_arrow

• question_answer44)
  The structure of solid crystals is investigated by using   [CPMT 1992; NCERT 1975; CBSEPMT 1992]
  A)
             Cosmic rays                           done clear
  B)
             X-rays done clear
  C)
             Infrared radiations             done clear
  D)
             \[\gamma -\]rays done clear
  View Solution play_arrow

• question_answer45)
  In an X-rays tube, the intensity of the emitted X-rays beam is increased by           [MNR 1992; RPMT 1996; UPSEAT 2000]
  A)
             Increasing the filament current done clear
  B)
             Decreasing the filament current done clear
  C)
             Increasing the target potential done clear
  D)
             Decreasing the target potential done clear
  View Solution play_arrow

• question_answer46)
  The binding energy of the innermost electron in tungsten is 40 keV. To produce characteristic X-rays using a tungsten target in an X-rays tube the potential difference V between the cathode and the anti-cathode should be [IIT 1985]
  A)
             V< 40 kV                                 done clear
  B)
             V \[\le \] 40 kV done clear
  C)
             V > 40 kV                                done clear
  D)
             V >/< 40 kV done clear
  View Solution play_arrow

• question_answer47)
  In above question the energy of the characteristic X-rays given out is                                     [IIT 1985]
  A)
             Less than 40 keV                  done clear
  B)
             More than 40 keV done clear
  C)
             Equal to 40 keV                    done clear
  D)
             \[\ge \]40 keV done clear
  View Solution play_arrow

• question_answer48)
  The wavelength of most energetic X-rays emitted when a metal target is bombarded by 40KeV  electrons, is approximately (\[h=6.62\times {{10}^{-34}}\] J-sec; 1 eV = \[1.6\times {{10}^{-19}}\]J; c = \[3\times {{10}^{8}}\,m/s)\] [MNR 1991; MP PMT 1999; UPSEAT 2000; Pb. PET 2004]
  A)
             300 Å                                        done clear
  B)
             10 Å done clear
  C)
             4 Å done clear
  D)
             0.31 Å done clear
  View Solution play_arrow

• question_answer49)
  X-rays which can penetrate through longer distances in substance are called               [EAMCET 1983]
  A)
             Soft X-rays                             done clear
  B)
             Continuous X-rays done clear
  C)
             Hard X-rays                            done clear
  D)
             None of the above done clear
  View Solution play_arrow

• question_answer50)
  An X-ray machine has an accelerating potential difference of 25,000 volts. By calculation the shortest wavelength will be obtained as (\[h=6.62\times {{10}^{-34}}\] J?sec; e = \[1.6\times {{10}^{-19}}\]coulomb) [MP PET 1994]
  A)
             0.25 Å                                       done clear
  B)
             0.50 Å done clear
  C)
             1.00 Å                                       done clear
  D)
             2.50 Å done clear
  View Solution play_arrow

• question_answer51)
  For the production of X-rays of wavelength 0.1 Å the minimum potential difference will be [MP PMT 1994; RPMT 1995]
  A)
             12.4 kV                                    done clear
  B)
             24.8 kV done clear
  C)
             124 kV                                      done clear
  D)
             248 kV done clear
  View Solution play_arrow

• question_answer52)
  Mosley measured the frequency (f) of the characteristic X-rays from many metals of different atomic number (Z) and represented his results by a relation known as Mosley's law. This law is (a, b are constants)         [MP PMT 1994; RPMT 1996]
  A)
             \[f=a{{(Z-b)}^{2}}\]            done clear
  B)
             \[Z=a{{(f-b)}^{2}}\] done clear
  C)
             \[{{f}^{2}}=a(Z-b)\]            done clear
  D)
             \[f=a{{(Z-b)}^{1/2}}\] done clear
  View Solution play_arrow

• question_answer53)
  Penetrating power of X-rays depends on      [MP PMT 1994]
  A)
             Current flowing in the filament done clear
  B)
             Applied potential difference done clear
  C)
             Nature of the target done clear
  D)
             All the above done clear
  View Solution play_arrow

• question_answer54)
  The energy of a photon of characteristic X-rays from  a Coolidge tube comes from                  [MP PET 1995]
  A)
             The kinetic energy of the striking electron done clear
  B)
             The kinetic energy of the free electrons of the target done clear
  C)
             The kinetic energy of the ions of the target done clear
  D)
             An electronic transition of the target atom done clear
  View Solution play_arrow

• question_answer55)
  An X-ray tube operates on 30 kV. What is the minimum wavelength emitted \[(h=6.6\times {{10}^{-34}}\]Js, \[e=1.6\times {{10}^{-19}}\]Coulomb, \[c=3\times {{10}^{8}}\]ms?1)  [MP PMT 1995; DPMT 2001, 03]
  A)
             0.133 Å                                    done clear
  B)
             0.4 Å done clear
  C)
             1.2 Å                                         done clear
  D)
             6.6 Å done clear
  View Solution play_arrow

• question_answer56)
  The wavelength of the most energetic X?ray emitted when a metal target is bombarded by 100 KeV  electrons is approximately                                                             [MP PET 1996]
  A)
             12 Å                                          done clear
  B)
             4 done clear
  C)
             0.31 Å                                       done clear
  D)
             0.124 Å done clear
  View Solution play_arrow

• question_answer57)
  An electron beam in an X-ray tube is accelerated through a potential difference of 50000 volts. These are then made to fall on a tungsten target. The shortest wavelength of the X-ray emitted by the tube is                                              [MP PET 1997]
  A)
             2.5 Å                                         done clear
  B)
             0.25 nm done clear
  C)
             0.25 cm                                    done clear
  D)
             0.025 nm done clear
  View Solution play_arrow

• question_answer58)
  For harder X-rays                                                        [MP PET 1997]
  A)
             The wavelength is higher done clear
  B)
             The intensity is higher done clear
  C)
             The frequency is higher   done clear
  D)
             The photon energy is lower done clear
  View Solution play_arrow

• question_answer59)
  When cathode rays strike a metal target of high melting point with very high velocity, then [MP PMT 1997; AIIMS 1999]
  A)
             X-rays are produced          done clear
  B)
             Ealpha-rays are produced done clear
  C)
             TV waves are produced   done clear
  D)
             Ultrasonic waves are produced done clear
  View Solution play_arrow

• question_answer60)
  Penetrating power of X-rays can be increased by [MP PMT 1997, 2000]
  A)
             Increasing the potential difference between anode and cathode done clear
  B)
             Decreasing the potential difference between anode and cathode done clear
  C)
             Increasing the cathode filament current done clear
  D)
             Decreasing the cathode filament current done clear
  View Solution play_arrow

• question_answer61)
  \[{{K}_{\alpha }}\]characteristic X-ray refers to the transition  [MP PMT 1999]
  A)
             \[n=2\] to \[n=1\]               done clear
  B)
             \[n=3\] to \[n=2\] done clear
  C)
             \[n=3\] to \[n=1\]               done clear
  D)
             \[n=4\] to \[n=2\] done clear
  View Solution play_arrow

• question_answer62)
  X-rays are produced in X-ray tube operating at a given accelerating voltage. The wavelength of the continuous X-rays has values from                                                 [IIT 1998; BVP 2003]
  A)
             0 to \[\infty \] done clear
  B)
             \[{{\lambda }_{\min }}\] to\[\infty \], where \[{{\lambda }_{\min }}>0\] done clear
  C)
             \[0\] to \[{{\lambda }_{\max }}\] where \[{{\lambda }_{\max }}<\infty \] done clear
  D)
             \[{{\lambda }_{\min }}\] to \[{{\lambda }_{\max }}\], where 0 < \[{{\lambda }_{\min }}<{{\lambda }_{\max }}<\infty \] done clear
  View Solution play_arrow

• question_answer63)
  The wavelength of X-rays is                       [EAMCET (Med.) 1995]
  A)
             2000 Å                                      done clear
  B)
             2 Å done clear
  C)
             1 mm                                        done clear
  D)
             1 cm done clear
  View Solution play_arrow

• question_answer64)
  The ratio of the energy of an X-ray photon of wavelength 1 Å to that of visible light of wavelength 5000 Å  is [EAMCET (Med.) 1995]
  A)
             1: 5000                                     done clear
  B)
             5000 : 1 done clear
  C)
             1 :25 \[\times \]106                   done clear
  D)
             25 \[\times \]106 done clear
  View Solution play_arrow

• question_answer65)
  According to Mosley's law, the frequency of a spectral line in X-ray spectrum varies as [EAMCET (Med.) 1995; Pb. PMT 1999]
  A)
             Atomic number of the element done clear
  B)
             Square of the atomic number of the element done clear
  C)
             Square root of the atomic number of the element done clear
  D)
             Fourth power of the atomic number of the element done clear
  View Solution play_arrow

• question_answer66)
  For the structural analysis of crystals, X-rays are used because                   [IIT 1992; JIPMER 2000]
  A)
             X-rays have wavelength of the order of interatomic spacing done clear
  B)
             X-rays are highly penetrating radiations done clear
  C)
             Wavelength of X-rays is of the order of nuclear size done clear
  D)
             X-rays are coherent radiations done clear
  View Solution play_arrow

• question_answer67)
  The essential distinction between X-rays and \[\gamma -\]rays is that   [BHU 1994; RPMT 1991; JIPMER 2001, 02]
  A)
             \[\gamma -\]rays have smaller wavelength than X-rays done clear
  B)
             \[\gamma -\]rays emanate from nucleus while X-rays emanate from outer part of the atom done clear
  C)
             \[\gamma -\]rays have greater ionizing power than X-rays done clear
  D)
             \[\gamma -\]rays are more penetrating than X-rays done clear
  View Solution play_arrow

• question_answer68)
  The minimum wavelength of the X-rays produced by electrons accelerated through a potential difference of V volts is directly proportional to                   [CBSE PMT 1996]
  A)
             \[\sqrt{V}\]                           done clear
  B)
             \[{{V}^{2}}\] done clear
  C)
             \[1/\sqrt{V}\]                       done clear
  D)
             \[1/V\] done clear
  View Solution play_arrow

• question_answer69)
  What determines the hardness of the X-rays obtained from the Coolige tube                                     [RPMT 1996]
  A)
             Current in the filament     done clear
  B)
             Pressure of air in the tube done clear
  C)
             Nature of target done clear
  D)
             Potential difference between cathode and target done clear
  View Solution play_arrow

• question_answer70)
  The most penetrating radiation out of the following is  [CBSE PMT 1997]
  A)
             X-rays                                      done clear
  B)
             \[\beta \]-rays done clear
  C)
             \[\alpha -\]particles           done clear
  D)
             \[\gamma -\]rays done clear
  View Solution play_arrow

• question_answer71)
  On increasing the number of electrons striking the anode of an X-ray tube, which one of the following parameters of the resulting X-rays would increase   [SCRA 1998; DPMT 2000]
  A)
             Penetration power            done clear
  B)
             Frequency done clear
  C)
             Wavelength                          done clear
  D)
             Intensity done clear
  View Solution play_arrow

• question_answer72)
  What kV  potential is to be applied on X-ray tube so that minimum wavelength of emitted  X-rays may be 1Å (\[h=6.625\times {{10}^{-34}}\]J-sec)                                                                      [UPSEAT 1999]
  A)
             \[12.42\,kV\]                        done clear
  B)
             \[12.84kV\] done clear
  C)
             \[11.98kV\]                            done clear
  D)
             \[10.78kV\] done clear
  View Solution play_arrow

• question_answer73)
  X-rays cannot be deflected by means of an ordinary grating due to          [Pb. PMT 1999; MH CET 2000; BCECE 2004]
  A)
             Large wavelength               done clear
  B)
             High speed done clear
  C)
             Short wavelength               done clear
  D)
             None of these done clear
  View Solution play_arrow

• question_answer74)
  Consider the following two statements A and B and identify the correct choice in the given answer A:       The characteristic X-ray spectrum depends on the nature of the material of the target. B:       The short wavelength limit of continuous X-ray spectrum varies inversely with the potential difference applied to the X-rays tube                                          [EAMCET (Med.) 2000]
  A)
             A is true and B is false       done clear
  B)
             A is false and B is true done clear
  C)
             Both A and B are true        done clear
  D)
             Both A and B are false done clear
  View Solution play_arrow

• question_answer75)
  The energy of an X- ray photon of wavelength 1.65 Å is \[(h=6.6\times {{10}^{-34}}J\text{-}sec,\,\,c=3\times {{10}^{8}}m{{s}^{-1}}\], \[1eV=1.6\times {{10}^{-19}}J)\] [EAMCET (Engg.) 2000]
  A)
              3.5 keV                                   done clear
  B)
             5.5 keV done clear
  C)
             7.5 keV                                    done clear
  D)
             9.5 keV done clear
  View Solution play_arrow

• question_answer76)
  If \[\lambda \]=10Å, then it corresponds to                                   [DCE 2000]        
  A)
             Infra-red                                 done clear
  B)
             Microwave done clear
  C)
             Ultra-violet                            done clear
  D)
             X-rays done clear
  View Solution play_arrow

• question_answer77)
  Bragg?s law for X-rays is                                           [UPSEAT 2001]
  A)
              d sin \[\theta \]= \[2n\lambda \]  done clear
  B)
              \[2d\,\sin \,\theta =n\lambda \] done clear
  C)
             \[n\sin \theta =2\lambda d\] done clear
  D)
             None of these done clear
  View Solution play_arrow

• question_answer78)
  The X-rays produced in a coolidge tube of potential difference 40V have minimum wavelength of [MH CET (Med.) 2001]
  A)
             \[3.09\times {{10}^{-8}}m\]   done clear
  B)
             \[5.09\times {{10}^{8}}m\] done clear
  C)
             \[4.09\times {{10}^{-8}}m\]   done clear
  D)
             \[1.09\times {{10}^{8}}m\] done clear
  View Solution play_arrow

• question_answer79)
  For the production of X-rays, the target should be made of                                         [BHU 2000; CPMT 2001]
  A)
             Steel                                         done clear
  B)
             Copper done clear
  C)
             Aluminum                              done clear
  D)
             Tungsten done clear
  View Solution play_arrow

• question_answer80)
  Intensity of X-rays depends upon the number of  [SCRA 1998; DPMT 2000; AFMC 2001]
  A)
             Electrons                                done clear
  B)
             Protons done clear
  C)
             Neutrons                                done clear
  D)
             Positrons done clear
  View Solution play_arrow

• question_answer81)
  In an X-ray tube electrons bombarding the target produce X-rays of minimum wavelength 1 Å. What must be the energy of bombarding electrons                                 [KCET 2001]
  A)
             13375 eV                                 done clear
  B)
             12375 eV done clear
  C)
             14375 eV                                 done clear
  D)
             15375 eV done clear
  View Solution play_arrow

• question_answer82)
  If energy of K-shell electron is ? 40000 eV  and If 60000 V  potential is applied at coolidge tube then which of the following X-ray will get form                                      [RPET 2001]
  A)
             Continuous                            done clear
  B)
             White X-rays done clear
  C)
             Continuous and all series of characteristic done clear
  D)
             None of these done clear
  View Solution play_arrow

• question_answer83)
  For production of characteristic \[{{K}_{\beta }}\,\]X-rays, the electron transition is                                         [MP PET 2001]
  A)
             \[n=2\,\,\,\text{to}\,\,\,n=1\]                                          done clear
  B)
             \[n=\,3\,\,\,\text{to}\,\,\,n=2\] done clear
  C)
             \[n=3\,\,\,\text{to}\,\,\,n=1\]                                          done clear
  D)
             \[n=4\,\,\,\text{to}\,\,\,n=2\] done clear
  View Solution play_arrow

• question_answer84)
  Penetrating power of X-rays does not depend on  [MP PET 2001]
  A)
             Wavelength                          done clear
  B)
             Energy done clear
  C)
             Potential difference          done clear
  D)
             Current in the filament done clear
  View Solution play_arrow

• question_answer85)
  The potential difference applied to an X-ray tube is 5kV and the current through it is 3.2 mA. Then the number of electrons striking the target per second is  [IIT-JEE (Screening) 2002] 
  A)
             \[2\times {{10}^{16}}\]     done clear
  B)
             \[5\times {{10}^{16}}\] done clear
  C)
             \[1\times {{10}^{17}}\]     done clear
  D)
             \[4\times {{10}^{15}}\] done clear
  View Solution play_arrow

• question_answer86)
  For the production of characteristic \[{{K}_{\gamma }},\]X-ray, the electron transition is                                                [BHU 2002]
  A)
             \[n=2\,\,\,to\,\,\,n=1\]    done clear
  B)
             \[n=3\,\,\,to\,\,n=2\] done clear
  C)
             \[n=3\,\,\,to\,\,n=1\]       done clear
  D)
             \[n=4\,\,\,to\,\,n=1\] done clear
  View Solution play_arrow

• question_answer87)
  When X  rays pass through a strong uniform magnetic field, Then they   [MP PET 2002; RPMT 2002, 03]
  A)
             Do not get deflected at all done clear
  B)
             Get deflected in the direction of the field done clear
  C)
             Get deflected in the direction opposite to the field done clear
  D)
             Get deflected in the direction perpendicular to the field done clear
  View Solution play_arrow

• question_answer88)
  If the potential difference applied across X-ray tube is V volts, then approximately minimum wavelength of the emitted X-rays will be                                           [MP PET 2002; RPMT 1995; CBSE PMT 1996]
  A)
  \[\frac{1227}{\sqrt{V}}{AA}\]                                          done clear
  B)
  \[\frac{1240}{V}{AA}\] done clear
  C)
  \[\frac{2400}{V}{AA}\]    done clear
  D)
  \[\frac{12400}{V}{AA}\] done clear
  View Solution play_arrow

• question_answer89)
  What is the difference between soft and hard X-rays  [MP PMT 2002; AIIMS 2002]
  A)
             Velocity done clear
  B)
             Intensity done clear
  C)
             Frequency                             done clear
  D)
             Polarization done clear
  View Solution play_arrow

• question_answer90)
  X-ray will travel minimum distance in                 [MP PET 2003]
  A)
             Air  done clear
  B)
             Iron done clear
  C)
             Wood                                       done clear
  D)
             Water done clear
  View Solution play_arrow

• question_answer91)
  The minimum wavelength of X-ray emitted by X-rays tube is 0.4125 Å. The accelerating voltage is [BHU 2003; CPMT 2004; MP PMT 2005]
  A)
             30 kV                                        done clear
  B)
             50 kV done clear
  C)
             80 kV                                        done clear
  D)
             60 kV done clear
  View Solution play_arrow

• question_answer92)
  Characteristic X-rays are produced due to         [AIIMS 2003]
  A)
             Transfer of momentum in collision of electrons with target atoms done clear
  B)
             Transition of electrons from higher to lower electronic orbits in an atom done clear
  C)
             Heating of the target done clear
  D)
             Transfer of energy in collision of electrons with atoms in the target done clear
  View Solution play_arrow

• question_answer93)
  X-rays when incident on a metal        [BCECE 2003; RPMT 2003]
  A)
             Exert a force on it               done clear
  B)
             Transfer energy to it done clear
  C)
             Transfer pressure to it      done clear
  D)
             All of the above done clear
  View Solution play_arrow

• question_answer94)
  The minimum wavelength of X-rays produced in a coolidge tube operated at potential difference of 40 kV is [BCECE 2003; RPET 2002, 03]
  A)
             0.31 Å                                       done clear
  B)
             3.1 Å done clear
  C)
             31 Å                                          done clear
  D)
             311 Å done clear
  View Solution play_arrow

• question_answer95)
  The potential difference between the cathode and the target in a Collidge tube is 100 kV. The minimum wavelength of the X-rays emitted by the tube is                                                        [Pb. PMT 2004]
  A)
             0.66 Å                                       done clear
  B)
             9.38 Å done clear
  C)
             0.246 Å                                    done clear
  D)
             0.123 Å done clear
  View Solution play_arrow

• question_answer96)
  X-rays are produced by accelerating electrons by voltage V and let they strike a metal of atomic number Z. The highest frequency of X-rays produced is proportional to [UPSEAT 2004]
  A)
             V     done clear
  B)
             Z done clear
  C)
             (Z ? 1)                                      done clear
  D)
             \[{{(Z-1)}^{2}}\] done clear
  View Solution play_arrow

• question_answer97)
  If the operating potential of an X-ray tube is 50 kV, the velocity of X-rays coming out of it              is             [RPMT 2003]
  A)
             \[4\times {{10}^{4}}\,m/s\]    done clear
  B)
             \[3\times {{10}^{8}}\,m/s\] done clear
  C)
             \[{{10}^{8}}\,m/s\]             done clear
  D)
             \[3\,m/s\] done clear
  View Solution play_arrow

• question_answer98)
  If the voltage of X-ray tube is doubled, the intensity of X-rays will become                                           [RPMT 2003]
  A)
             Half                                           done clear
  B)
             Unchanged done clear
  C)
             Double                                    done clear
  D)
             Four times done clear
  View Solution play_arrow

• question_answer99)
  If the minimum wavelength obtained in an X-ray tube is \[2.5\times {{10}^{-10}}m\], the operating potential of the tube will be                                                                                              [RPMT 2003]
  A)
             2 kV                                          done clear
  B)
             3 kV done clear
  C)
             4 kV                                          done clear
  D)
             5 kV done clear
  View Solution play_arrow

• question_answer100)
  The wavelength of X-rays decreases, when      [RPMT 2002]
  A)
             Temperature of target is increased done clear
  B)
             Intensity of electron beam is increased done clear
  C)
             K.E. of electrons striking the target is increased done clear
  D)
             K.E. of electrons striking the target is decreased done clear
  View Solution play_arrow

• question_answer101)
  X-rays are produced in laboratory by                    [RPMT 1998]
  A)
             Radiation done clear
  B)
             Decomposition of the atom done clear
  C)
             Bombardment of high energy electron on heavy metal done clear
  D)
             None of these done clear
  View Solution play_arrow

• question_answer102)
  In vacuum an electron of energy 10 keV hits tungsten target, then emitted radiation will be         [RPMT 2001]
  A)
             Cathode rays                        done clear
  B)
             X-rays done clear
  C)
             Infrared rays                         done clear
  D)
             Visible spectrum done clear
  View Solution play_arrow

• question_answer103)
  X-rays of \[\lambda =1\,{AA}\] have frequency                               [DCE 1998]
  A)
   \[3\times {{10}^{8}}\,Hz\]       done clear
  B)
  \[3\times {{10}^{18}}\,Hz\] done clear
  C)
  \[3\times {{10}^{10}}\,Hz\]    done clear
  D)
  \[3\times {{10}^{15}}\,Hz\] done clear
  View Solution play_arrow

• question_answer104)
  Solid targets of different elements are bombarded by highly energetic electron beams. The frequency (f) of the characteristic X-rays emitted from different targets varies with atomic number Z as                                         [AIIMS 2005]
  A)
             \[f\propto \sqrt{Z}\]         done clear
  B)
             \[f\propto {{Z}^{2}}\] done clear
  C)
             \[f\propto Z\]                       done clear
  D)
             \[f\propto {{Z}^{3/2}}\] done clear
  View Solution play_arrow

• question_answer105)
  Compton effect shows that                                     [DPMT 1995]
  A)
             X-rays are waves done clear
  B)
             X-rays have high energy done clear
  C)
             X-rays can penetrate matter done clear
  D)
             Photons have momentum done clear
  View Solution play_arrow

• question_answer106)
  An X-ray tube with a copper target emits Cu \[{{K}_{\alpha }}\] line of wavelength 1.50 Å. What should be the minimum voltage through which electrons are to be accelerated to produce this wavelength of X rays\[(h=6.63\times {{10}^{-34}}J\text{-}\sec ,\ c=3\times {{10}^{8}}m/s)\] [Orissa JEE 1996]
  A)
             8280 V                                      done clear
  B)
             828 V done clear
  C)
             82800 V                                   done clear
  D)
             8.28 V done clear
  View Solution play_arrow

• question_answer107)
  In X-ray spectrum wavelength l of line \[{{K}_{\alpha }}\] depends on atomic number Z as                          [RPMT 1995; DCE 2002]
  A)
             \[\lambda \propto {{Z}^{2}}\]                                           done clear
  B)
             \[\lambda \propto {{(Z-1)}^{2}}\] done clear
  C)
             \[\lambda \propto \frac{1}{(Z-1)}\]                                done clear
  D)
             \[\lambda \propto \frac{1}{{{(Z-1)}^{2}}}\] done clear
  View Solution play_arrow

• question_answer108)
  Absorption of X-ray is maximum in which of the following different sheets                                          [RPMT 1995]
  A)
             Copper                                    done clear
  B)
             Gold done clear
  C)
             Beryllium                                done clear
  D)
             Lead done clear
  View Solution play_arrow

• question_answer109)
  The wavelength of \[{{K}_{\alpha }}\] line in copper is 1.54 Å. The ionisation energy of K electron in copper in Joule is [EAMCET 1984]
  A)
             \[11.2\times {{10}^{-27}}\]     done clear
  B)
             \[12.9\times {{10}^{-16}}\] done clear
  C)
             \[1.7\times {{10}^{-15}}\]       done clear
  D)
             \[10\times {{10}^{-16}}\] done clear
  View Solution play_arrow

• question_answer110)
  The wavelength of \[{{K}_{\alpha }}\] line for an element of atomic number 43 is l. Then the wavelength of \[{{K}_{\alpha }}\] line for an element of atomic number 29 is
  A)
             \[\frac{43}{29}\lambda \]        done clear
  B)
             \[\frac{42}{28}\lambda \] done clear
  C)
             \[\frac{9}{4}\lambda \]     done clear
  D)
             \[\frac{4}{9}\lambda \] done clear
  View Solution play_arrow

• question_answer111)
  In X-ray experiment Ka, Kb denotes                         [DCE 2005]
  A)
             Characteristic done clear
  B)
             Continuous wavelength done clear
  C)
             a, b-emissions respectively done clear
  D)
             None of these done clear
  View Solution play_arrow