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Physics · 2025 · 1 mark
Dual Nature of Radiation and MatterExperimental Study of Photoelectric Effect1 markUnderstandassertion reason
CBSE 2025 · Region 4 · Set 1 · Q16
Assertion (A): For monochromatic incident radiation, the emitted photoelectrons from a given metal have speed ranging from zero to a certain maximum…
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
(B)
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
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CBSE Class 12 Physics past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.