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MHT CET 2025 (21 Apr, Shift 1) · Photoelectric Effect: Einstein's Equation

Photoelectric Effect: Einstein's Equation question from MHT CET 2025 (21 Apr, Shift 1)

Q44MHT CET 2025 · 21 APR · SHIFT 1Medium

Photoelectric Effect: Einstein's Equation

Photoelectric emission is observed from a metallic surface for frequencies $v_1$ and $v_2$ of the incident light rays $(v_1 > v_2)$ . If the maximum values of kinetic energy of the photoelectrons emitted in the two cases are in the ratio of $1 : k$ , then the threshold frequency of metallic surface is

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Answer: (d)

$K = h(v - v_0)$ , so $\frac{v_1 - v_0}{v_2 - v_0} = \frac{1}{k}$ .
$kv_1 - kv_0 = v_2 - v_0 \Rightarrow v_0(k - 1) = kv_1 - v_2$
So the answer is (d) $v_0 = \frac{kv_1 - v_2}{k - 1}$ .

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