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RGPV Unit – 1 Wave Nature Of Particle MCQs
Q1. Matter waves are
1. elastic waves
2. electromagnetic waves
3. show diffraction
4. transverse wave
Answer:- 3) show diffraction
Q2. The wavelength 2 associated with a particle of mass m moving with velocity v is given by
1. λ=h/mv
2. λ=m/hv
3. λ=mv/h
4. λ=hv/m
Answer:- 1) λ=h/mv
Q3. The De-Broglie hypothesis is associated with _______
1. wave nature of electrons only
2. wave nature of a-particle only
3. wave nature of radiations
4. wave nature of all material particles
Answer:- 4)wave nature of all material particles
Q4. De -Broglie wavelength of a material particle having kinetic energy. E is proportional to _________
1.√E
2.1/√E
3.E
4.1/E
Answer:- 2)1√E
Q5. The equation of motion of matter-wave was derived by _________
1. Heisenberg
2. Bohr
3. De-Broglie
4. Schrodinger
Answer:-4) Schrodinger
Q6. In which direction the recoil electron in Compton scattering has the maximum energy _______
1. 0
2. 90°
3. 180°
4. 45°
Answer:- 3) 180°
Q7. Compton shift (∆λ) depends on ________
1. incident wavelength
2. angle of scattering
3. target material
4. energy of incident light
Answer:- 2) angle of scattering
Q8. According to wave mechanics, a material particle is associated with _____
1. single wave
2. wave packet
3. progressive wave
4. lightwave
Answer:- 2) ware packet
Q9. The wavelength of the matter waves is independent of ______
1. mass
2. velocity
3. charge
4. momentum
Answer:- 3) charge
Q10. Assuming the velocity to be the same, which particle is having the longest wavelength _________
1. an electron
2. a proton
3. a neutron
4. an a-particle
Answer:- 1) an electron
Q11. The rest mass of a photon is _____
1. zero
2. 1.67 × 10-³¹ kg
3. 1.9 × 10-²⁷ kg
4. infinity
Answer:- 1) zero
Q12. The group velocity of matter waves is _____
1. less than particle velocity
2. equal to particle velocity
3. shows diffraction
4. transverse wave
Answer:- 2) equal to particle velocity
Q13. A photon and an electron have the same wavelength then ______
1. photon has greater momentum
2. electron has greater momentum
3. both have the same momentum
4. none of the above
Answer:- 3) both have the same momentum
Q14. Matter waves were first experimentally observed by ______
1. De-Broglie
2. Schrodinger
3. Davisson and Germer
4. Bohr
Answer:- 3) Davidson and Germer
Q15. Davisson and Germer experimentally observed by ______
1. interference
2. polarisation
3. electron diffraction
4. phosphoresce
Answer:- 3) electron diffraction
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Q16. Dual nature of matter was predicted by _____
1. Schrodinger
2. Louis de- Broglie
3. G.P. Thomson
4. Werner Heisenberg
Answer:- 2) G.P. Thomson
Q17. The phase velocity (Vp) and the group velocity (Vg) of a de-Broglie wave in free space are related as ______
1. Vp=Vg
2. VpVg=c²
3. Vp=Vg/2
4. Vp=c²/2Vg
Answer:- 2) VpVg=c²
Q18.) The uncertainty principle states that the error in measurement is due to ______
1. dual nature of particles
2. due to the small size of particles
3. due to the large size of a particle
4. due to error in measuring instrument
Answer:- 1) dual nature of particle
Q19. The product of uncertainties between position and momentum is given by ______
1. ∆x∆p=λ
2. ∆x∆p=h
3. ∆x∆p=nh
4. ∆x∆p=mv
Answer:- 2) ∆x∆p=h
Q20. If the uncertainty in the location of a particle is equal to de-Broglie wavelength the uncertainty in its velocity will be _____
1. equal to its velocity
2. half of its velocity
3. twice its velocity
4. four times its velocity
Answer:- 1) equal to its velocity
Q22. Which of the following can act as both a particle and as a wave?
1. Photon
2. Electron
3. Neutron
4. All of these
Answer:- 4) All of these
Q21.) For a non-relativistic free particle, the phase velocity (Vp) and group velocity (Vg) is related as _____
1. Vp = Vg
2. Vp =vg/ 2
3. Vp = 2 Vg
4. Vg = V²p/2
Answer:- 2) Vp=Vg/2
Q23. A proton with an energy of 2.05 MeV has a De-Broglie wavelength of _____
1. 3×10-¹⁹m
2. 3×10-¹⁷m
3. 2×10-¹⁴
4. 1.5 × 10-¹⁴
Answer:- 3) 2×10-¹⁴
Q24. An electron is in a box 2 nm across. What will be the lowest energy for the electron?
1. 0.01 eV
2. 0.08375 eV
3. 0.2 eV
4. 1.5 eV
Answer:- 2) 0.08375eV
Q26. X-rays were discovered by ______
1. Moseley
2. Duane and hurt
3. W. L. Bragg
4. W. Roentgen
Answer:- 4) W. Roentgen
Q25. The velocity of X-rays in a vacuum is _____
1. less than the velocity of light
2. equal to the velocity of light
3. greater than the velocity of light
4. none of these
Answer:- 2) equal to the velocity of light
Q27. In Compton effect the electron that takes part is _______
1. free
2. bound
3. maybe free or bound
4. emitted from the nucleus by the decay of neutrons
Answer:- 4) emitted from the nucleus by the decay of neutrons
Q28. Compton shift is given by ______
1. h/me c²(1-cosϕ)
2. h/ me c (1-sin ϕ )
3. h/me c( 1-cos ϕ )
4. h/me c² ( 1+ cos ϕ)
Answer:- 3) h/me c(1-cosϕ)
Q29. Compton shift ∆λ is maximum when the angle of scattering of the photon (ϕ) is ______
1. ϕ=π
2. ϕ= 0
3. ϕ =π/2
4. ϕ = π /4
Answer:- 1) ϕ=π
Q30. Compton effort is associated with ______
1. Visible light
2. X-rays
3. β-rays
4. Positive rays
Answer:- 2) X-rays
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