Photoelectric effect supports quantum nature of light because

Options

A. there is a minimum frequecy of light below which no photoelectrons are emitted
B. the maximum K.E. of photoelectron emitted depends only on the frequency of the incident light and not on its intensity.
C. even when metal surface is faintly illuminated, the photoelectrons leave the surface immediately.
D. electric charge of photoelectron is quantised.

Answer

a,b,c

Explanation

According to quantum theory of light, the energy of photons will not change, if the intensity of light is increased or decreased. Since one incident photon of light can eject one photoelectron form the surface of metal provided its frequency is greater than threshold frequency, and KE of emitted photoelectrons is `(KE)_(max)=hv-phi_(0)`. Thus option (a), (c), (d) are true.