CUET · PHYSICS · PYQ PAPER 2023

Stopping potential for photoelectrons :

A does not depend on the frequency of the incident light
B does not depend on the nature of the material of cathode
C depends on both the frequency of the incident light and the nature of the material of cathode
D depends on the intensity of the incident light

Verified Solution

Answer & Solution

Correct Answer

(C) depends on both the frequency of the incident light and the nature of the material of cathode

Step-by-step Solution

Detailed explanation

According to Einstein's photoelectric equation, \(e V_0=h v-\Phi_0\), the stopping potential ( \(V_0\) ) depends on the frequency ( \(v\) ) of the light and the work function ( \(\Phi_0\) ), which is specific to the nature of the cathode material. It is independent of the…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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