In the context of the Photoelectric effect, identify the statements which support quantum nature of light.

(A) The electric charge of photoelectrons is quantized
(B) The maximum kinetic energy of photoelectrons depends on the frequency of the incident light, but is independent of its intensity
(C) The photoelectric emission is an instantaneous process without any apparent time lag, even when the incident radiation is made exceedingly dim
(D) There is a minimum frequency of light below which no photoelectrons are emitted

Choose the correct answer from the options given below:

(B), (C) and (D) only

The correct answer is Option (3) → (B), (C) and (D) only

(A) The electric charge of photoelectrons is quantized — Incorrect. The quantization of electric charge is a general property of electrons and is not specific evidence for the quantum nature of light in the photoelectric effect.

(B) The maximum kinetic energy of photoelectrons depends on the frequency of the incident light, but is independent of its intensity — Correct. This shows that energy is carried in discrete packets (photons), where energy depends only on frequency. This directly supports the quantum nature of light.

(C) The photoelectric emission is an instantaneous process without any apparent time lag, even when the incident radiation is made exceedingly dim — Correct. If light were a wave, energy would accumulate over time. Instant emission shows that energy is transferred in discrete quanta (photons), supporting quantum theory.

(D) There is a minimum frequency of light below which no photoelectrons are emitted — Correct. This threshold frequency cannot be explained by classical wave theory and supports the idea that light energy is quantized.