Question

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: In photoelectric effect, on increasing the intensity of incident light the stopping potential increases. Reason R: Increase in intensity of light increases the rate of photoelectrons emitted, provided the frequency of incident light is greater than threshold frequency.

• A. Both $\mathbf{A}$ and $\mathbf{R}$ are true but $\mathbf{R}$ is NOT the correct explanation of $\mathbf{A}$
• B. $\mathbf{A}$ is false but $\mathbf{R}$ is true
• C. $\mathbf{A}$ is true but $\mathbf{R}$ is false
• D. Both $\mathbf{A}$ and $\mathbf{R}$ are true and $\mathbf{R}$ is the correct explanation of $\mathbf{A}$

Hint:

The stopping potential in the photoelectric effect does not depend on the intensity of light.

Answer 1

The Correct Option is B

1. Assertion A: - The stopping potential does not depend on the intensity of light. 
- Therefore, Assertion A is false. 
2. Reason R: - Increasing the intensity of light increases the rate of photoelectrons emitted. 
- Therefore, Reason R is true. 
Therefore, the correct answer is (2) $\mathbf{A}$ is false but $\mathbf{R}$ is true.