The quantum nature of light explains the observations on photoelectric effect as -

Physics · Class 12 · CBSE — Dual Nature of Radiation & Matter

1. there is a minimum frequency of incident radiation below which no electrons are emitted.
2. the maximum kinetic energy of photoelectrons depends only on the frequency of incident radiation.
3. when the metal surface is illuminated, electrons are ejected from the surface after sometime.
4. the photoelectric current is independent of the intensity of incident radiation.

Answer

(A) there is a minimum frequency of incident radiation below which no electrons are emitted.

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