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MHT CET 2024 (15 May, Shift 1) · Photoelectric Effect: Einstein's Equation

Photoelectric Effect: Einstein's Equation question from MHT CET 2024 (15 May, Shift 1)

Q56MHT CET 2024 · 15 MAY · SHIFT 1Easy

Photoelectric Effect: Einstein's Equation

Two photons having energies twice and thrice the work function of metal are incident one after another on the metal surface. Then the ratio of maximum velocities of the photoelectrons emitted in the two cases is respectively

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Answer: (c)

$v \propto \sqrt{E - W}$
$K_1 = 2W - W = W$ , $K_2 = 3W - W = 2W$
$\frac{v_1}{v_2} = \sqrt{\frac{W}{2W}} = \frac{1}{\sqrt{2}}$
So the answer is (c) $1 : \sqrt{2}$ .

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