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MHT CET 2023 (12 May, Shift 1) · Photoelectric Effect: Einstein's Equation

Photoelectric Effect: Einstein's Equation question from MHT CET 2023 (12 May, Shift 1)

Q76MHT CET 2023 · 12 MAY · SHIFT 1Easy

Photoelectric Effect: Einstein's Equation

Radiations of two photons having energies twice and five times the work function of metal are incident successively on metal surface. The ratio of the maximum velocity of photo electrons emitted in the two cases will be

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Answer: (b)

$v \propto \sqrt{E - W}$
$K_1 = 2W - W = W$ , $K_2 = 5W - W = 4W$
$\frac{v_1}{v_2} = \sqrt{\frac{W}{4W}} = \frac{1}{2}$
So the answer is (b) 1 : 2.

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