Question: Q. 3. Explain giving reasons for the following :
(i) Photoelectric current in a photocell increases with the increase in the intensity of the incident radiation.
(ii) The stopping potential
(iii) Maximum kinetic energy of the photoelectrons is independent of the intensity of incident radiation.
U [OD II 2017]
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Solution:
Ans. (i) The collision of a photon can cause emission of a photoelectron (if the frequency is above the threshold frequency). As intensity if the frequency increases, number of photons increases. Hence, the current increases.
(ii) We have,
Graph of
is a constant.
(iii) Maximum K.E. for different surfaces
[CBSE Marking Scheme 2017]
