CBSE 2025 · Region 4 · Set 1 · Q16 · 1 mark
Assertion (A) : For monochromatic incident radiation, the emitted photoelectrons from a given metal have speed ranging from zero to a certain maximum value.
Reason (R) : Each metal has a definite work function.
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 the Assertion (A).
Dual Nature of Radiation and MatterExperimental Study of Photoelectric EffectUnderstandassertion_reasonmedium
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CBSE Class 12 Physics past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.