Paper 1 Wave-Particle Duality Drills
Q1
Wave-particle duality means
A. entities such as light/electrons can show wave-like and particle-like behaviour.
B. waves and particles are identical classical objects.
C. light has mass at rest.
D. electrons have no charge.
Q2
Photoelectric effect supports the photon model because energy transfer depends on
A. frequency of individual photons.
B. wave amplitude only.
C. screen distance only.
D. slit separation.
Q3
Electron diffraction supports electron
A. wave behaviour.
B. nuclear charge only.
C. thermal expansion.
D. chemical reactivity only.
Q4
de Broglie relation is
A. .
B. .
C. .
D. .
Q5
A higher momentum particle has
A. shorter de Broglie wavelength.
B. longer de Broglie wavelength.
C. zero wavelength always.
D. undefined wavelength.
Q6
Diffraction is most noticeable when aperture size is
A. comparable to wavelength.
B. much smaller than all particles only.
C. infinite.
D. unrelated to wavelength.
Q7
Photon momentum is
A. .
B. .
C. with rest mass only.
D. .
Q8
The same electron can be detected as a localized event after passing through a diffraction setup. This shows
A. particle-like detection with wave-like propagation.
B. no wave behaviour.
C. classical orbit only.
D. loss of charge.
Q9
Increasing electron accelerating voltage generally
A. increases electron wavelength.
B. decreases electron wavelength.
C. does not affect momentum.
D. stops diffraction.
Q10
Wave-particle duality does not mean
A. choosing the model appropriate to evidence.
B. the object is literally a tiny classical ball and classical water wave simultaneously.
C. electrons can diffract.
D. photons can transfer energy in quanta.
Q11
The Davisson-Germer type evidence involved
A. electron diffraction by crystals.
B. alpha decay.
C. gas expansion.
D. pendulum motion.
Q12
For non-relativistic electrons accelerated through p.d. , kinetic energy is
A. .
B. .
C. for all accelerating voltages.
D. .
Q13
If electron speed increases, its de Broglie wavelength
A. decreases.
B. increases.
C. is unchanged.
D. becomes infinite.
Q14
Electron diffraction is most readily observed when the electron de Broglie wavelength is
A. much larger than the apparatus.
B. comparable to the spacing of the diffracting crystal planes.
C. exactly zero.
D. independent of electron momentum.
Q15
A classical wave explanation alone struggles with photoelectric effect because it predicts energy can accumulate with
A. time and intensity below threshold.
B. frequency threshold exactly.
C. instant emission only above threshold.
D. one photon-one electron.
Q16
A classical particle explanation alone struggles with electron diffraction because particles should not
A. produce wave interference patterns.
B. have momentum.
C. hit screens.
D. carry charge.
Q17
Which observation is direct evidence for the particulate nature of electromagnetic radiation?
A. diffraction at a narrow slit.
B. interference fringes from two coherent sources.
C. photoelectron emission governed by photon frequency and a threshold frequency.
D. polarisation of transverse waves.
Q18
Macroscopic objects have negligible observed de Broglie wavelengths because their
A. charges are zero.
B. energies are zero.
C. momenta are large compared with .
D. masses are quantum forbidden.
Q19
For light, increasing wavelength
A. increases photon energy.
B. decreases photon energy and momentum.
C. leaves photon momentum unchanged.
D. makes frequency infinite.
Q20
If the momentum of a non-relativistic particle doubles, its de Broglie wavelength becomes
A. four times as large.
B. twice as large.
C. unchanged.
D. half as large.