Q. The frequency and intensity of a light source are doubled. Consider the following statements Saturation photocurrent remains almost the same. Maximum kinetic energy of the photoelectrons is doubled.
A) Both I and II are true
B) I is true but II is false.
C) I is false but II is true.
D) Both I and II are false.
Explanation
(c) The saturation photocurrent (i) depends on intensity ($I$) of light ie,
$i \propto I$.
So, when intensity changes, the saturation current also changes. Hence the statement I false.
The maximum kinetic energy depends upon the frequency of light. So, the kinetic energy is doubled when frequency is doubled.
So, statement II is true.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.