MHT CET 2025 Physics question

If the frequency of incident light in a photoelectric experiment is doubled, then stopping potential will

(A)be doubled.
(B)be halved.
(C)become more than double.Correct
(D)become less than double.

Answer: (C)

Solution

Einstein's equation gives , so . When the frequency is doubled, eV_0'=2hf-\phi=2(hf-\phi)+\phi=2eV_0+\phi. Because the work function is positive, , so the

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Question ID VK-102618