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MHT CET 2024 (2 May, Shift 1) · Photoelectric Effect: Einstein's Equation

Photoelectric Effect: Einstein's Equation question from MHT CET 2024 (2 May, Shift 1)

Q69MHT CET 2024 · 2 MAY · SHIFT 1Medium

Photoelectric Effect: Einstein's Equation

The work function of metal ' $A$ ' and ' $B$ ' are in the ratio $1 : 2$ . If light of frequency ' $f$ ' and ' $2f$ ' is incident on surface ' $A$ ' and ' $B$ ' respectively, then the ratio of kinetic energies of emitted photo electrons is

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Answer: (b)

Let $\phi_A = \phi$ , $\phi_B = 2\phi$ .
$K_A = hf - \phi$ , $K_B = 2hf - 2\phi = 2(hf - \phi)$
$K_A : K_B = 1 : 2$
So the answer is (b) $1 : 2$ .

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