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MHT CET 2021 (21 Sep, Shift 2) · Photoelectric Effect: Einstein's Equation

Photoelectric Effect: Einstein's Equation question from MHT CET 2021 (21 Sep, Shift 2)

Q114MHT CET 2021 · 21 SEP · SHIFT 2Medium

Photoelectric Effect: Einstein's Equation

Photoemission from metal surface takes place for frequencies ' $v_1$ ' and ' $v_2$ ' of incident rays $(v_1 > v_2)$ . Maximum kinetic energy of photoelectrons emitted is in the ratio $1 : K$ . 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) $\frac{Kv_1 - v_2}{K - 1}$ .

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