Question

Assertion-Reason Type Question Assertion (A): In photoelectric effect, stopping potential depends upon frequency of incident radiation.
Reason (R): Maximum kinetic energy of emitted electrons increases with frequency. Choose the correct answer from the options given below:

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

Hint:

Remember: \[ V_0=\frac{hf-\phi}{e} \] Stopping potential increases with frequency.

Answer 1

The Correct Option is A

Step 1: Recall Einstein photoelectric equation. \[ K_{\max}=hf-\phi \] Thus: \[ K_{\max}\propto f \]

Step 2: Relation with stopping potential. \[ eV_0=K_{\max} \] Hence: \[ V_0\propto f \] Thus stopping potential depends on frequency. Both Assertion and Reason are true and Reason correctly explains Assertion. Therefore: \[ \boxed{\text{Both Assertion and Reason are true and Reason is the correct explanation of Assertion.}} \]