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MHT CET 2026 (11 Apr, Shift 1) · Photoelectric Effect: Einstein's Equation

Photoelectric Effect: Einstein's Equation question from MHT CET 2026 (11 Apr, Shift 1)

Q27MHT CET 2026 · 11 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 $k : 1$ , then what is the threshold frequency of the metallic surface?

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Answer: (d)

$K = h(v - v_0)$ , so $\frac{v_1 - v_0}{v_2 - v_0} = k$ .
$v_1 - v_0 = kv_2 - kv_0 \Rightarrow v_0(k - 1) = kv_2 - v_1$
So the answer is (d) $v_0 = \frac{kv_2 - v_1}{k - 1}$ .

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