Dual nature of radiation — practice questions
10 questions in the bank on this idea. Below are 10 of them, exactly as they appear in a test.
The dual nature of radiation means light can exhibit
- A. both wave-like and particle-like behaviour
- B. only wave behaviour
- C. only classical particle behaviour
- D. neither interference nor photoelectric effects
A photon of frequency f has energy
- A. h/f
- B. hf
- C. fc
- D. hfc
Photon momentum is
- A. p=hλ
- B. p=λ/h
- C. p=h/λ
- D. p=hf²
Which phenomenon most directly demonstrates the wave nature of light?
- A. Photoelectric threshold frequency
- B. Discrete photon energy transfer
- C. Electron emission from a metal
- D. Interference
Which phenomenon strongly supports the particle nature of light?
- A. Photoelectric effect
- B. Young's double-slit interference only
- C. Diffraction around an aperture
- D. Polarisation alone
If photon frequency doubles, its energy
- A. halves
- B. doubles
- C. quadruples
- D. is unchanged
If photon wavelength halves, its momentum
- A. halves
- B. quadruples
- C. doubles
- D. is unchanged
Two photons have wavelengths 400 nm and 800 nm. The 400 nm photon has
- A. half the energy
- B. the same energy
- C. four times the energy
- D. twice the energy
Why can a beam of very low intensity still eject photoelectrons if its frequency exceeds threshold?
- A. Each photon can individually carry enough energy hf to liberate an electron
- B. Intensity alone determines energy of every photon
- C. Electrons accumulate energy from unlimited weak photons in the basic photoelectric model
- D. Threshold depends only on beam area
A photon has energy E and momentum p. Which relation is valid in vacuum?
- A. E=p/c
- B. E=pc
- C. E=p²c
- D. E=mc² with nonzero photon rest mass
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