JEE Main & Advanced Physics Atomic Physics Question Bank

done Topic Test - Atomic Physics Total Questions - 40

• question_answer1)
  If in nature there may not be an element for which the principal quantum number n > 4, then the total possible number of elements will be
  A)
  60 done clear
  B)
  32 done clear
  C)
  4 done clear
  D)
  64 done clear
  View Solution play_arrow

• question_answer2)
  The ionisation potential of hydrogen atom is 13.6 volt. The energy required to remove an electron in the n = 2 state of the hydrogen atom is
  A)
  27.2 eV done clear
  B)
  13.6eV done clear
  C)
  6.8eV done clear
  D)
  3.4eV done clear
  View Solution play_arrow

• question_answer3)
  An electron makes a transition from orbit n = 4 to the orbit n = 2 of a hydrogen atom. The wave number of the emitted radiations (R = Rydberg's constant) will be
  A)
  \[\frac{16}{3R}\] done clear
  B)
  \[\frac{2R}{16}\] done clear
  C)
  \[\frac{3R}{16}\] done clear
  D)
  \[\frac{4R}{16}\] done clear
  View Solution play_arrow

• question_answer4)
  According to Bohr's model, the radius of the second orbit of helium atom is              
  A)
  0.53 \[\overset{\text{o}}{\mathop{\text{A}}}\,\] done clear
  B)
  1.06 \[\overset{\text{o}}{\mathop{\text{A}}}\,\] done clear
  C)
  2.12 \[\overset{\text{o}}{\mathop{\text{A}}}\,\] done clear
  D)
  0.265 \[\overset{\text{o}}{\mathop{\text{A}}}\,\] done clear
  View Solution play_arrow

• question_answer5)
  Hydrogen atoms are excited from ground state of the principal quantum number 4. Then the number of spectral lines observed will be  
  A)
  3 done clear
  B)
  6 done clear
  C)
  5 done clear
  D)
  2 done clear
  View Solution play_arrow

• question_answer6)

  Which of the following statements are true regarding Bohr's model of hydrogen atom

  (I)         Orbiting speed of electron decreases as it shifts to discrete orbits away from the nucleus

  (II)        Radii of allowed orbits of electron are proportional to the principal quantum number

  (III)       Frequency with which electrons orbits around the nucleus in discrete orbits is inversely proportional to             the principal quantum number

  (IV)      Binding force with which the electron is bound to the nucleus increases as it shifts to outer orbits

  Select correct answer using the codes given below

  Codes :

  A)
  I and III done clear
  B)
  II and IV done clear
  C)
  I, II and III done clear
  D)
  II, III and IV done clear
  View Solution play_arrow

• question_answer7)
  What will be the angular momentum of a electron, if energy of this electron in H-atom is 1.5eV (in J-sec)
  A)
  \[1.05\times {{10}^{-34}}\] done clear
  B)
  \[2.1\times {{10}^{-34}}\] done clear
  C)
  \[3.15\times {{10}^{-34}}\] done clear
  D)
  \[-2.1\times {{10}^{-34}}\] done clear
  View Solution play_arrow

• question_answer8)
  The energy of hydrogen atom in its ground state is - 13.6 eV. The energy of the level corresponding to the quantum number n is equal 5 is             
  A)
  - 5.40 eV done clear
  B)
  - 2.72 eV done clear
  C)
  - 0.85 eV done clear
  D)
  - 0.54 eV done clear
  View Solution play_arrow

• question_answer9)
  Energy of an electron in an excited hydrogen atom is - 3.4 eV. Its angular momentum will be: \[h=6.626\times {{10}^{-34}}J-s\]
  A)
  \[1.11\times {{10}^{34}}J\ \sec \] done clear
  B)
  \[1.51\times {{10}^{-31}}J\ \sec \] done clear
  C)
  \[2.11\times {{10}^{-34}}J\ \sec \] done clear
  D)
  \[3.72\times {{10}^{-34}}J\ \sec \] done clear
  View Solution play_arrow

• question_answer10)
  Which state of triply ionised Baryllium \[(B{{e}^{+++}})\] has the same orbital radius as that of the ground state of hydrogen
  A)
  n = 4 done clear
  B)
  n = 3 done clear
  C)
  n = 2 done clear
  D)
  n = 1 done clear
  View Solution play_arrow

• question_answer11)
  As the electron in Bohr orbit of Hydrogen atom passes from state \[n=2\] to \[n=1\], the kinetic energy K and potential energy U change as
  A)
  K two-fold, U four-fold done clear
  B)
  K four-fold, U two-fold done clear
  C)
  K four-fold, U also four-fold done clear
  D)
  K two-fold, U also two-fold done clear
  View Solution play_arrow

• question_answer12)
  Radius of first Bohr orbit is r. What is the radius of 2nd Bohr orbit?                
  A)
  8 done clear
  B)
  2r done clear
  C)
  4r done clear
  D)
  \[2\sqrt{2r}\] done clear
  View Solution play_arrow

• question_answer13)
  In the above figure D and E respectively represent 
  A)
  Absorption line of Balmer series and the ionization potential of hydrogen done clear
  B)
  Absorption line of Balmer series and the wavelength lesser than lowest of the Lyman series done clear
  C)
  Spectral line of Balmer series and the maximum wavelength of Lyman series done clear
  D)
  Spectral line of Lyman series and the absorption of greater wavelength of limiting value of Paschen series done clear
  View Solution play_arrow

• question_answer14)
  Every series of hydrogen spectrum has an upper and lower limit in wavelength. The spectral series which has an upper limit of wavelength equal to 18752 \[\overset{\text{o}}{\mathop{\text{A}}}\,\] is      
  A)
  Balmer series done clear
  B)
  Lyman series done clear
  C)
  Paschen series done clear
  D)
  Pfund series done clear
  View Solution play_arrow

• question_answer15)
  According to Bohr's theory the radius of electron in an orbit described by principal quantum number n and atomic number Z is proportional to
  A)
  \[{{Z}^{2}}{{n}^{2}}\] done clear
  B)
  \[\frac{{{Z}^{2}}}{{{n}^{2}}}\] done clear
  C)
  \[\frac{{{Z}^{2}}}{n}\] done clear
  D)
  \[\frac{{{n}^{2}}}{Z}\] done clear
  View Solution play_arrow

• question_answer16)
  A hydrogen atom (ionisation potential 13.6 eV) makes a transition from third excited state to first excited state. The energy of the photon emitted in the process is
  A)
  1.89 eV done clear
  B)
  2.55 eV done clear
  C)
  12.09 eV done clear
  D)
  12.75 eV done clear
  View Solution play_arrow

• question_answer17)
  Which of the following statements about the Bohr model of the hydrogen atom is false
  A)
  Acceleration of electron in n = 2 orbit is less than that in n = 1 orbit done clear
  B)
  Angular momentum of electron in n = 2 orbit is more than that in n = 1 orbit done clear
  C)
  Kinetic energy of electron in n = 2 orbit is less than that in n = 1 orbit done clear
  D)
  Potential energy of electron in n = 2 orbit is less than that in n = 1 orbit done clear
  View Solution play_arrow

• question_answer18)
  The Rydberg constant R for hydrogen is
  A)
  \[R=-\left( \frac{1}{4\pi {{\varepsilon }_{0}}} \right).\frac{2{{\pi }^{2}}m{{e}^{2}}}{c{{h}^{2}}}\] done clear
  B)
  \[R=\left( \frac{1}{4\pi {{\varepsilon }_{0}}} \right).\frac{2{{\pi }^{2}}m{{e}^{4}}}{c{{h}^{2}}}\] done clear
  C)
  \[R={{\left( \frac{1}{4\pi {{\varepsilon }_{0}}} \right)}^{2}}.\frac{2{{\pi }^{2}}m{{e}^{4}}}{{{c}^{2}}{{h}^{2}}}\] done clear
  D)
  \[R={{\left( \frac{1}{4\pi {{\varepsilon }_{0}}} \right)}^{2}}.\frac{2{{\pi }^{2}}m{{e}^{4}}}{c{{h}^{3}}}\] done clear
  View Solution play_arrow

• question_answer19)
  The third line of Balmer series of an ion equivalent to hydrogen atom has wavelength of 108.5 nm. The ground state energy of an electron of this ion will be
  A)
  3.4 eV done clear
  B)
  13.6 eV done clear
  C)
  54.4 eV done clear
  D)
  122.4 eV done clear
  View Solution play_arrow

• question_answer20)
  Hydrogen atom excites energy level from fundamental state to n = 3. Number of spectrum lines according to Bohr, is
  A)
  4 done clear
  B)
  3 done clear
  C)
  1 done clear
  D)
  2 done clear
  View Solution play_arrow

• question_answer21)
  When an electron in hydrogen atom is excited, from its 4th to 5th stationary orbit, the change in angular momentum of electron is (Planck’s constant: \[h=6.6\times {{10}^{-34}}J\text{-s}\]
  A)
  \[4.16\times {{10}^{-34}}\,J\text{-}s\] done clear
  B)
  \[3.32\times {{10}^{-34}}\,J\text{-}s\] done clear
  C)
  \[1.05\times {{10}^{-34}}\,J\text{-}s\] done clear
  D)
  \[2.08\times {{10}^{-34}}\,J\text{-}s\] done clear
  View Solution play_arrow

• question_answer22)
  In hydrogen atom, if the difference in the energy of the electron in \[n=2\] and \[n=3\] orbits is E, the ionization energy of hydrogen atom is       
  A)
  13.2 E done clear
  B)
  7.2 E done clear
  C)
  5.6 E done clear
  D)
  3.2 E done clear
  View Solution play_arrow

• question_answer23)
  Orbital acceleration of electron is       
  A)
  \[\frac{{{n}^{2}}{{h}^{2}}}{4{{\pi }^{2}}{{m}^{2}}{{r}^{3}}}\] done clear
  B)
  \[\frac{{{n}^{2}}{{h}^{2}}}{2{{n}^{2}}{{r}^{3}}}\] done clear
  C)
  \[\frac{4{{n}^{2}}{{h}^{2}}}{{{\pi }^{2}}{{m}^{2}}{{r}^{3}}}\] done clear
  D)
  \[\frac{4{{n}^{2}}{{h}^{2}}}{4{{\pi }^{2}}{{m}^{2}}{{r}^{3}}}\] done clear
  View Solution play_arrow

• question_answer24)
  The wavelength of light emitted from second orbit to first orbits in a hydrogen atom is
  A)
  \[1.215\times {{10}^{-7}}m\] done clear
  B)
  \[1.215\times {{10}^{-5}}m\] done clear
  C)
  \[1.215\times {{10}^{-4}}m\] done clear
  D)
  \[1.215\times {{10}^{-3}}m\] done clear
  View Solution play_arrow

• question_answer25)
  The possible quantum number for 3d electron are      
  A)
  \[n=3,\,l=1,\,{{m}_{l}}=+1,\,{{m}_{s}}=-\frac{1}{2}\] done clear
  B)
  \[n=3,\,l=2,\,{{m}_{l}}=+2,\,{{m}_{s}}=-\frac{1}{2}\] done clear
  C)
  \[n=3,\,l=1,\,{{m}_{l}}=-1,\,{{m}_{s}}=+\frac{1}{2}\] done clear
  D)
  \[n=3,\,l=0,\,{{m}_{l}}=+1,\,{{m}_{s}}=-\frac{1}{2}\] done clear
  View Solution play_arrow

• question_answer26)
  Which of the following is quantised according to Bohr’s theory of hydrogen atom    
  A)
  Linear momentum of electron done clear
  B)
  Angular momentum of electron done clear
  C)
  Linear velocity of electron done clear
  D)
  Angular velocity of electron done clear
  View Solution play_arrow

• question_answer27)
  In Bohr’s model of hydrogen atom, which of the following pairs of quantities are quantized
  A)
  Energy and linear momentum  done clear
  B)
  Linear and angular momentum done clear
  C)
  Energy and angular momentum done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer28)
  What is the ratio of wavelength of radiations emitted when an electron in hydrogen atom jump from fourth orbit to second orbit and from third orbit to second orbit
  A)
  27 : 25 done clear
  B)
  20 : 27 done clear
  C)
  20 : 25 done clear
  D)
  25 : 27 done clear
  View Solution play_arrow

• question_answer29)
  In the following atoms and moleculates for the transition from n= 2 to n = 1, the spectral line of minimum wavelength will be produced by
  A)
  Hydrogen atom done clear
  B)
  Deuterium atom done clear
  C)
  Uni-ionized helium done clear
  D)
  di-ionized lithium done clear
  View Solution play_arrow

• question_answer30)
  The energy required to knock out the electron in the third orbit of a hydrogen atom is equal to
  A)
  \[13.6\ eV\] done clear
  B)
  \[+\frac{13.6}{9}eV\] done clear
  C)
  \[-\frac{13.6}{3}eV\] done clear
  D)
  \[-\frac{3}{13.6}eV\] done clear
  View Solution play_arrow

• question_answer31)
  The following diagram indicates the energy levels of a certain atom when the system moves from 2E level to E, a photon of wavelength \[\lambda \] is emitted. The wavelength of photon produced during its transition from \[\frac{4E}{3}\] level to E is            
  A)
  \[\lambda /3\] done clear
  B)
  \[3\lambda /4\] done clear
  C)
  \[4\lambda /3\] done clear
  D)
  \[3\lambda \] done clear
  View Solution play_arrow

• question_answer32)
  The ratio of the kinetic energy to the total energy of an electron in a Bohr orbit is
  A)
  -1         done clear
  B)
  2 done clear
  C)
  1 : 2 done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer33)
  According to Bohr's theory, the expressions for the kinetic and potential energy of an electron revolving in an orbit is given respectively by
  A)
  \[+\frac{{{e}^{2}}}{8\pi {{\varepsilon }_{0}}r}\]and \[-\frac{{{e}^{2}}}{4\pi {{\varepsilon }_{0}}r}\] done clear
  B)
  \[+\frac{8\pi {{\varepsilon }_{0}}{{e}^{2}}}{r}\]and\[-\frac{4\pi {{\varepsilon }_{0}}{{e}^{2}}}{r}\] done clear
  C)
  \[-\frac{{{e}^{2}}}{8\pi {{\varepsilon }_{0}}r}\]and \[-\frac{{{e}^{2}}}{4\pi {{\varepsilon }_{0}}r}\] done clear
  D)
  \[+\frac{{{e}^{2}}}{8\pi {{\varepsilon }_{0}}r}\]and \[+\frac{{{e}^{2}}}{4\pi {{\varepsilon }_{0}}r}\] done clear
  View Solution play_arrow

• question_answer34)
  The velocity of an electron in the second orbit of sodium atom (atomic number = 11) is v. The velocity of an electron in its fifth orbit will be                        
  A)
  v done clear
  B)
  \[\frac{22}{5}v\] done clear
  C)
  \[\frac{5}{2}v\] done clear
  D)
  \[\frac{2}{5}v\] done clear
  View Solution play_arrow

• question_answer35)
  The extreme wavelengths of Paschen series are
  A)
  \[0.365\mu m\]and \[0.565\mu m\] done clear
  B)
  \[0.818\mu m\]and \[1.89\mu m\] done clear
  C)
  \[1.45\mu m\]and \[4.04\mu m\]  done clear
  D)
  \[2.27\mu m\]and \[7.43\mu m\] done clear
  View Solution play_arrow

• question_answer36)
  The energy of a hydrogen atom in its ground state is \[-13.6\ eV\]. The energy of the level corresponding to the quantum number n = 2 (first excited state) in the hydrogen atom is
  A)
  - 2.72 eV done clear
  B)
  - 0.85 eV done clear
  C)
  - 0.54 eV done clear
  D)
  - 3.4 eV done clear
  View Solution play_arrow

• question_answer37)
  The wavelength of the energy emitted when electron come from fourth orbit to second orbit in hydrogen is \[20.397\,cm\]. The wavelength of energy for the same transition in \[H{{e}^{+}}\] is        
  A)
  \[5.099\ c{{m}^{-1}}\] done clear
  B)
  \[20.497\ c{{m}^{-1}}\] done clear
  C)
  \[40.994\ c{{m}^{-1}}\] done clear
  D)
  \[81.988\ c{{m}^{-1}}\] done clear
  View Solution play_arrow

• question_answer38)
  If \[{{\lambda }_{\max }}\] is 6563 \[\overset{\text{o}}{\mathop{\text{A}}}\,\], then wave length of second line for Balmer series will be          
  A)
  \[\lambda =\frac{16}{3R}\] done clear
  B)
  \[\lambda =\frac{36}{5R}\] done clear
  C)
  \[\lambda =\frac{4}{3R}\]      done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer39)
  The electron in a hydrogen atom makes a transition from an excited state to the ground state. Which of the following statements is true        
  A)
  Its kinetic energy increases and its potential and total energies decrease done clear
  B)
  Its kinetic energy decreases, potential energy increases and its total energy remains the same done clear
  C)
  Its kinetic and total energies decrease and its potential energy increases done clear
  D)
  Its kinetic, potential and total energies decreases done clear
  View Solution play_arrow

• question_answer40)
  The first line in the Lyman series has wavelength l. The wavelength of the first line in Balmer series is         
  A)
  \[\frac{2}{9}\lambda \] done clear
  B)
  \[\frac{9}{2}\lambda \] done clear
  C)
  \[\frac{5}{27}\lambda \] done clear
  D)
  \[\frac{27}{5}\lambda \] done clear
  View Solution play_arrow