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question_answer1)
The idea of matter waves was given by
A)
Davisson and Germer done
clear
B)
de-Broglie done
clear
C)
Einstein done
clear
D)
Planck done
clear
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question_answer2)
Wave is associated with matter
A)
When it is stationary done
clear
B)
When it is in motion with the velocity of light only done
clear
C)
When it is in motion with any velocity done
clear
D)
None of the above done
clear
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question_answer3)
The de-Broglie wavelength associated with the particle of mass m moving with velocity v is [CBSE PMT 1992]
A)
\[h/mv\] done
clear
B)
\[mv/h\] done
clear
C)
\[mh/v\] done
clear
D)
\[4\times {{10}^{4}}\] done
clear
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question_answer4)
A photon, an electron and a uranium nucleus all have the same wavelength. The one with the most energy [MP PMT 1992]
A)
Is the photon done
clear
B)
Is the electron done
clear
C)
Is the uranium nucleus done
clear
D)
Depends upon the wavelength and the properties of the particle. done
clear
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question_answer5)
A particle which has zero rest mass and non-zero energy and momentum must travel with a speed [MP PMT 1992; DPMT 2001; Kerala PMT 2004]
A)
Equal to c, the speed of light in vacuum done
clear
B)
Greater than c done
clear
C)
Less than c done
clear
D)
Tending to infinity done
clear
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question_answer6)
When the kinetic energy of an electron is increased, the wavelength of the associated wave will
A)
Increase done
clear
B)
Decrease done
clear
C)
Wavelength does not depend on the kinetic energy done
clear
D)
None of the above done
clear
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question_answer7)
If the de-Broglie wavelengths for a proton and for a \[\alpha -\]particle are equal, then the ratio of their velocities will be [NCERT 1972]
A)
4 : 1 done
clear
B)
2 : 1 done
clear
C)
1 : 2 done
clear
D)
1 : 4 done
clear
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question_answer8)
The de-Broglie wavelength \[\lambda \]associated with an electron having kinetic energy E is given by the expression [MP PMT 1990; CPMT 1996]
A)
\[\frac{h}{\sqrt{2mE}}\] done
clear
B)
\[\frac{2h}{mE}\] done
clear
C)
\[2mhE\] done
clear
D)
\[\frac{2\sqrt{2mE}}{h}\] done
clear
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question_answer9)
Dual nature of radiation is shown by [MP PET 1991]
A)
Diffraction and reflection done
clear
B)
Refraction and diffraction done
clear
C)
Photoelectric effect alone done
clear
D)
Photoelectric effect and diffraction done
clear
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question_answer10)
For the Bohr's first orbit of circumference \[2\pi r\], the de-Broglie wavelength of revolving electron will be [MP PMT 1987]
A)
\[2\pi r\] done
clear
B)
\[\pi r\] done
clear
C)
\[\frac{1}{2\pi r}\] done
clear
D)
\[\frac{1}{4\pi r}\] done
clear
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question_answer11)
An electron of mass m when accelerated through a potential difference V has de-Broglie wavelength \[\lambda \]. The de-Broglie wavelength associated with a proton of mass M accelerated through the same potential difference will be [CBSE PMT 1995; EAMCET 2001; J & K CET 2004]
A)
\[\lambda \frac{m}{M}\] done
clear
B)
\[\lambda \sqrt{\frac{m}{M}}\] done
clear
C)
\[\lambda \frac{M}{m}\] done
clear
D)
\[\lambda \sqrt{\frac{M}{m}}\] done
clear
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question_answer12)
What will be the ratio of de-Broglie wavelengths of proton and \[\alpha -\]particle of same energy [RPET 1991, 96; DCE 2002; Kerala PET 2005]
A)
2 : 1 done
clear
B)
1 : 2 done
clear
C)
4 : 1 done
clear
D)
1 : 4 done
clear
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question_answer13)
What is the de-Broglie wavelength of the \[\alpha -\]particle accelerated through a potential difference V [RPMT 1996]
A)
\[\frac{0.287}{\sqrt{V}}\]Å done
clear
B)
\[\frac{12.27}{\sqrt{V}}\]Å done
clear
C)
\[\frac{0.101}{\sqrt{V}}\]Å done
clear
D)
\[\frac{0.202}{\sqrt{V}}\]Å done
clear
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question_answer14)
de-Broglie hypothesis treated electrons as [BHU 2000]
A)
Particles done
clear
B)
Waves done
clear
C)
Both ?a? and ?b? done
clear
D)
None of these done
clear
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question_answer15)
The energy that should be added to an electron, to reduce its de-Broglie wavelengths from \[{{10}^{-10}}\]m to \[0.5\times {{10}^{-10}}\]m, will be [KCET (Engg./Med.) 2000]
A)
Four times the initial energy done
clear
B)
Thrice the initial energy done
clear
C)
Equal to the initial energy done
clear
D)
Twice the initial energy done
clear
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question_answer16)
The de-Broglie wavelength of an electron having \[80eV\] of energy is nearly (1eV = 1.6 ´ 10?19 J, Mass of electron = 9 ´ 10?31kg Plank?s constant = 6.6 ´ 10?34 J-sec) [EAMCET (Engg.) 2001]
A)
140 Å done
clear
B)
0.14 Å done
clear
C)
14 Å done
clear
D)
1.4 Å done
clear
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question_answer17)
If particles are moving with same velocity, then maximum de-Broglie wavelength will be for [CBSE PMT 2002]
A)
Neutron done
clear
B)
Proton done
clear
C)
b-particle done
clear
D)
\[\alpha \]-particle done
clear
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question_answer18)
If an electron and a photon propagate in the form of waves having the same wavelength, it implies that they have the same [CBSE PMT 1995; DCE 2001; AIIMS 2003]
A)
Energy done
clear
B)
Momentum done
clear
C)
Velocity done
clear
D)
Angular momentum done
clear
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question_answer19)
The de-Broglie wavelength is proportional to [RPET 2003]
A)
\[\lambda \propto \frac{1}{\nu }\] done
clear
B)
\[\lambda \propto \frac{1}{m}\] done
clear
C)
\[\lambda \propto \frac{1}{p}\] done
clear
D)
\[\lambda \propto p\] done
clear
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question_answer20)
Particle nature and wave nature of electromagnetic waves and electrons can be shown by [AIIMS 2000]
A)
Electron has small mass, deflected by the metal sheet done
clear
B)
X-ray is diffracted, reflected by thick metal sheet done
clear
C)
Light is refracted and defracted done
clear
D)
Photoelectricity and electron microscopy done
clear
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question_answer21)
The de-Broglie wavelength of a particle moving with a velocity 2.25 ´ 108 m/s is equal to the wavelength of photon. The ratio of kinetic energy of the particle to the energy of the photon is (velocity of light is 3 ´ 108 m/s) [EAMCET (Med.) 2003]
A)
1/8 done
clear
B)
3/8 done
clear
C)
5/8 done
clear
D)
7/8 done
clear
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question_answer22)
According to de-Broglie, the de-Broglie wavelength for electron in an orbit of hydrogen atom is 10?9 m. The principle quantum number for this electron is [RPMT 2003]
A)
1 done
clear
B)
2 done
clear
C)
3 done
clear
D)
4 done
clear
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question_answer23)
The speed of an electron having a wavelength of \[{{10}^{-10}}m\] is [Manipal 1997; AIIMS 2002]
A)
\[7.25\times {{10}^{6}}\]m/s done
clear
B)
\[6.26\times {{10}^{6}}m/s\] done
clear
C)
\[5.25\times {{10}^{6}}m/s\] done
clear
D)
\[4.24\times {{10}^{6}}m/s\] done
clear
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question_answer24)
The kinetic energy of electron and proton is \[{{10}^{-32}}J\]. Then the relation between their de-Broglie wavelengths is [CPMT 1999]
A)
\[{{\lambda }_{p}}<{{\lambda }_{e}}\] done
clear
B)
\[{{\lambda }_{p}}>{{\lambda }_{e}}\] done
clear
C)
\[{{\lambda }_{p}}={{\lambda }_{e}}\] done
clear
D)
\[{{\lambda }_{p}}=2{{\lambda }_{e}}\] done
clear
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question_answer25)
The de-Broglie wavelength of a particle accelerated with 150 volt potential is \[{{10}^{-10}}\]m. If it is accelerated by 600 volts p.d., its wavelength will be [RPET 1988]
A)
0.25 Å done
clear
B)
0.5 Å done
clear
C)
1.5 Å done
clear
D)
2 Å done
clear
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question_answer26)
The de-Broglie wavelength associated with a hydrogen molecule moving with a thermal velocity of 3 km/s will be
A)
1 Å done
clear
B)
0.66 Å done
clear
C)
6.6 Å done
clear
D)
66 Å done
clear
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question_answer27)
When the momentum of a proton is changed by an amount P0, the corresponding change in the de-Broglie wavelength is found to be 0.25%. Then, the original momentum of the proton was [CPMT 2002]
A)
p0 done
clear
B)
100 p0 done
clear
C)
400 p0 done
clear
D)
4 p0 done
clear
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question_answer28)
The de-Broglie wavelength of a neutron at 27oC is l. What will be its wavelength at 927oC [DPMT 2002]
A)
l / 2 done
clear
B)
l / 3 done
clear
C)
l / 4 done
clear
D)
l / 9 done
clear
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question_answer29)
An electron and proton have the same de-Broglie wavelength. Then the kinetic energy of the electron is [Kerala PMT 2004]
A)
Zero done
clear
B)
Infinity done
clear
C)
Equal to the kinetic energy of the proton done
clear
D)
Greater than the kinetic energy of the proton done
clear
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question_answer30)
For moving ball of cricket, the correct statement about de-Broglie wavelength is [RPMT 2001]
A)
It is not applicable for such big particle done
clear
B)
\[\frac{h}{\sqrt{2mE}}\] done
clear
C)
\[\sqrt{\frac{h}{2mE}}\] done
clear
D)
\[\frac{h}{2mE}\] done
clear
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question_answer31)
Photon and electron are given same energy \[({{10}^{-20}}J)\]. Wavelength associated with photon and electron are \[{{\lambda }_{Ph}}\] and \[{{\lambda }_{el}}\] then correct statement will be [RPMT 2001]
A)
\[{{\lambda }_{Ph}}>{{\lambda }_{el}}\] done
clear
B)
\[{{\lambda }_{Ph}}<{{\lambda }_{el}}\] done
clear
C)
\[{{\lambda }_{Ph}}={{\lambda }_{el}}\] done
clear
D)
\[\frac{{{\lambda }_{el}}}{{{\lambda }_{Ph}}}=C\] done
clear
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question_answer32)
The kinetic energy of an electron with de-Broglie wavelength of 0.3 nanometer is [UPSEAT 2004]
A)
0.168 eV done
clear
B)
16.8 eV done
clear
C)
1.68 eV done
clear
D)
2.5 eV done
clear
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question_answer33)
A proton and an a-particle are accelerated through a potential difference of 100 V. The ratio of the wavelength associated with the proton to that associated with an a-particle is [DCE 2002; DPMT 2003]
A)
\[\sqrt{2}:1\] done
clear
B)
\[2:1\] done
clear
C)
\[2\sqrt{2}:1\] done
clear
D)
\[\frac{1}{2\sqrt{2}}:1\] done
clear
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question_answer34)
The wavelength of de-Broglie wave is 2mm, then its momentum is (h = 6.63 ´ 10?34 J-s) [DCE 2004]
A)
3.315 ´ 10?28 kg-m/s done
clear
B)
1.66 ´ 10?28 kg-m/s done
clear
C)
4.97 ´ 10?28 kg-m/s done
clear
D)
9.9 ´ 10?28 kg-m/s done
clear
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question_answer35)
de-Broglie wavelength of a body of mass 1 kg moving with velocity of 2000 m/s is [Pb. PMT 2003]
A)
3.32 ´ 10?27 Å done
clear
B)
1.5 ´ 107 Å done
clear
C)
0.55 ´ 10?22 Å done
clear
D)
None of these done
clear
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question_answer36)
The kinetic energy of an electron is 5 eV. Calculate the de-Broglie wavelength associated with it (h = 6.6 ´ 10?34 Js, me = 9.1 ´ 10?31 kg) [Pb. PMT 2004]
A)
5.47 Å done
clear
B)
10.9 Å done
clear
C)
2.7 Å done
clear
D)
None of these done
clear
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question_answer37)
The wavelength associated with an electron accelerated through a potential difference of 100 V is nearly [RPMT 2003]
A)
100 Å done
clear
B)
123 Å done
clear
C)
1.23 Å done
clear
D)
0.123 Å done
clear
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question_answer38)
The de-Broglie wavelength l [RPMT 2004]
A)
is proportional to mass done
clear
B)
is proportional to impulse done
clear
C)
Inversely proportional to impulse done
clear
D)
does not depend on impulse done
clear
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question_answer39)
Davission and Germer experiment proved [RPET 2002; DCE 2004]
A)
Wave nature of light done
clear
B)
Particle nature of light done
clear
C)
Both (a) and (b) done
clear
D)
Neither (a) nor (b) done
clear
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question_answer40)
If the kinetic energy of a free electron doubles, its de-Broglie wavelength changes by the factor [AIEEE 2005]
A)
\[\frac{1}{\sqrt{2}}\] done
clear
B)
\[\sqrt{2}\] done
clear
C)
\[\frac{1}{2}\] done
clear
D)
2 done
clear
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question_answer41)
The energy that should be added to an electron to reduce its de Broglie wavelength from one nm to 0.5 nm is [KCET 2005]
A)
Four times the initial energy done
clear
B)
Equal to the initial energy done
clear
C)
Twice the initial energy done
clear
D)
Thrice the initial energy done
clear
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question_answer42)
de-Broglie wavelength of a body of mass m and kinetic energy E is given by [BCECE 2005]
A)
\[\lambda =\frac{h}{mE}\] done
clear
B)
\[\lambda =\frac{\sqrt{2mE}}{h}\] done
clear
C)
\[\lambda =\frac{h}{2mE}\] done
clear
D)
\[\lambda =\frac{h}{\sqrt{2mE}}\] done
clear
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question_answer43)
The wavelength of the matter wave is independent of [Kerala PMT 2005]
A)
Mass done
clear
B)
Velocity done
clear
C)
Momentum done
clear
D)
Charge done
clear
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