Question

Assertion (A): Photoelectric current increases with an increase in intensity of incident radiation, for a given frequency of incident radiation and the accelerating potential.
Reason (R): Increase in the intensity of incident radiation results in an increase in the number of photoelectrons emitted per second and hence an increase in the photocurrent.

• A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
• B. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
• C. Assertion (A) is true, but Reason (R) is false.
• D. Assertion (A) is false and Reason (R) is also false.

Hint:

The intensity of radiation affects the number of photoelectrons emitted, which in turn increases the photocurrent.

Answer 1

The Correct Option is A

An increase in incident radiation intensity (at a fixed frequency) leads to a greater photon flux impinging on the surface. Consequently, more photoelectrons are emitted per second, augmenting the photocurrent. This observation is in complete accord with the preceding statement.