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(D) The wave theory of light suggests that the energy of a wave depends on its intensity (amplitude). According to wave theory,if light of any frequen

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All of these.

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(D) The wave theory of light suggests that the energy of a wave depends on its intensity (amplitude). According to wave theory,if light of any frequency is incident with sufficient intensity,it should eventually provide enough energy to eject electrons. However,experiments show that: $1$. There exists a threshold frequency below which no emission occurs,regardless of intensity $(A)$. $2$. The maximum kinetic energy of photoelectrons depends on the frequency of incident light,not its intensity $(B)$. $3$. Emission is instantaneous,whereas wave theory predicts a time lag for energy accumulation $(C)$. Since all these observations contradict the classical wave theory,the correct answer is $(D)$.

The wave nature of light cannot explain the photoelectric effect because,in the photoelectric effect,it is observed that:

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