Question

The frequency and intensity of a light source are doubled. Consider the following statements and judge whether it is true or false-
I. Saturation photocurrent remains almost the same.
II. 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.

Answer 1

Answer: (D)

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.
$h v = \phi + K E_{max}$
when $v$ is doubled $K E$ will change but it will be not be doubled.