CBSE 2026 · Region 2 · Set 1 · Q13 · 1 mark
Assertion (A) : On increasing the intensity of incident light of frequency $\displaystyle v\left(>v_{0}\right)$ on a photosensitive surface, the photocurrent increases.
Reason (R) : The stopping potential for a photosensitive surface increases with increase of frequency $\displaystyle v\left(>v_{0}\right)$ of incident light.
Official answer
From CBSE’s own marking scheme for this paper.
(B)
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
Dual Nature of Radiation and MatterExperimental Study of Photoelectric EffectAnalyseassertion_reasonmedium
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CBSE Class 12 Physics past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.