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MHT CET 2025 (5 May, Shift 2) · Photoelectric Effect: Einstein's Equation

Photoelectric Effect: Einstein's Equation question from MHT CET 2025 (5 May, Shift 2)

Q36MHT CET 2025 · 5 MAY · SHIFT 2Easy

Photoelectric Effect: Einstein's Equation

Energy of the incident photons on the metal surface is initially 4 W and then 6 W where $W$ is the work function of that metal. The ratio of velocities of emitted photoelectrons is

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Answer: (a)

$v \propto \sqrt{E - W}$
$K_1 = 4W - W = 3W$ , $K_2 = 6W - W = 5W$
$\frac{v_1}{v_2} = \sqrt{\frac{3}{5}}$
So the answer is (a) $\sqrt{3} : \sqrt{5}$ .

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