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NEET 2022 (Phase 2) · Photoelectric Effect: Einstein's Equation

Photoelectric Effect: Einstein's Equation question from NEET 2022 (Phase 2)

Q89NEET 2022 · PHASE 2Easy

Photoelectric Effect: Einstein's Equation

The light rays having photons of energy 4.2 eV are falling on a metal surface having a work function of 2.2 eV. The stopping potential of the surface is

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Answer: (c)

$eV_0 = E - \phi = 4.2 - 2.2 = 2\text{ eV}$
$V_0 = 2\text{ V}$ (a potential is in volts, not eV)
So the answer is (c) 2 V.

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