Explain giving reasons for the following :
(a) Photoelectric current in a photocell increases with the increase in intensity of the incident radiation.
(b) The stopping potential `V_0` varies linearly with the frequency `nu` of the incident radiation for a given photosensitive surface with the slope remaining the same for different surfaces.
(c) Maximum kinetic energy of the photoelectrons is independent of the intensity of incident radiation.

Explanation

(a) Photocurrent increases linearly with the intensity of incident radiation of same
frequency. As the intensity of incident rediation increases, the number of photons and
hence, the photoelectrons increases. So, photoelectric current increases.
(b) Stopping potential dependsd on intensity but of same frequency. It depends upon amount
of workdone hence, very linearly. As value of h/e (slope ) is same .
(c) As the frequency of incident radition does not changes, so ` KE_(max)` is constant.