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MHT CET 2020 (16 Oct, Shift 1) · Photoelectric Effect: Einstein's Equation

Photoelectric Effect: Einstein's Equation question from MHT CET 2020 (16 Oct, Shift 1)

Q121MHT CET 2020 · 16 OCT · SHIFT 1Easy

Photoelectric Effect: Einstein's Equation

Energy of the incident photon on the metal surface is $3W$ and then $5W$ , where $W$ is the work function for that metal. The ratio of velocities of emitted photoelectrons is

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Answer: (c)

$v \propto \sqrt{E - W}$
$K_1 = 3W - W = 2W$ , $K_2 = 5W - W = 4W$
$\frac{v_1}{v_2} = \sqrt{\frac{2W}{4W}} = \frac{1}{\sqrt{2}}$
So the answer is (c) $1 : \sqrt{2}$ .

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