Which of the following physical phenomena connot be described only by the wave theory of the electromagnetic radiation?
Correct answer: C. Photoelectric Effect
- A. Diffraction
- B. Interference
- C. Photoelectric Effect
- D. Polarization
Explanation
The correct answer is the Photoelectric Effect. This phenomenon cannot be adequately described by the wave theory of light alone because it demonstrates that light can behave as a stream of particles (photons), with each photon having a discrete energy that can be transferred to electrons. This is in contrast to wave-based phenomena like diffraction, interference, and polarization, which can be fully explained by the wave theory of electromagnetic radiation.
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About Dawn of Modern Physics
Classical physics cannot explain blackbody radiation and related observations, leading to Planck’s quantum theory, in which energy is emitted or absorbed in discrete packets. Photons provide the particle model of light, with energy and momentum linked to frequency and wavelength, including the photoelectric effect and its threshold frequency.
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