Practice portal › Dual Nature of Matter and Radiation › Conceptual and Statement Questions on the Photoelectric Effect

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Emission of electrons in photoelectric effect can be suppressed by applying a sufficiently negative electron potential to the photoemissive substance. Reason (R): A negative electric potential, which stops the emission of electrons from the surface of a photoemissive substance, varies linearly with frequency of incident radiation. In the light of the above statements, choose the most appropriate answer from the options given below:

Asked in JEE Main 29th Jan 1st Shift 2025 · Assertion, reason and statements

• (1) Both (A) and (R) are true and (R) is the correct explanation of (A).
• (2) (A) is true but (R) is false.
• (3) (A) is false but (R) is true.
• (4) Both (A) and (R) are true but (R) is not the correct explanation of (A).

Step-by-step solution

Why the other options are wrong

• (1) comes from treating the linear V₀ against u relation as the reason a retarding potential can stop the current
• (2) comes from doubting that the stopping potential is linear in frequency
• (3) comes from denying that a retarding potential can suppress the photocurrent at all

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