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Physics · 2025 · 1 mark
Dual Nature of Radiation and MatterExperimental Study of Photoelectric Effect1 markUnderstandassertion reason
CBSE 2025 · Region 7 · Set 1 · Q16
Assertion (A): The minimum negative potential applied to the anode in a photoelectric experiment at which photoelectric current becomes zero, is…
Assertion (A) : The minimum negative potential applied to the anode in a photoelectric experiment at which photoelectric current becomes zero, is called cut-off voltage. Reason $\displaystyle (R)$ : The threshold frequency for a metal is the minimum frequency of incident radiation below which emission of photoelectrons does not take place.
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.