alleryWhich of the following experimental phenomena could **NOT** be explained by classical EM wave theory?
ARefraction
BDiffraction
CPhotoelectric effect
DInterference
Answer & Solution
Correct answer: C. Photoelectric effect
Refraction, diffraction, interference are all natural consequences of wave behaviour.
The photoelectric effect — particularly the existence of a threshold frequency — needed Einstein's photon hypothesis (light as quantum particles) for an explanation.
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