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MHT CET 2025 (20 Apr, Shift 2) · Photoelectric Effect: Einstein's Equation

Photoelectric Effect: Einstein's Equation question from MHT CET 2025 (20 Apr, Shift 2)

Q45MHT CET 2025 · 20 APR · SHIFT 2Medium

Photoelectric Effect: Einstein's Equation

On a photosensitive material, when frequency of incident radiation is increased by $20\%$ , maximum kinetic energy of emitted photoelectrons increases from 0.4 eV to 0.7 eV. The work function of the material is

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Answer: (b)

$h\nu = K + \phi$ : $h\nu = 0.4 + \phi$ and $1.2h\nu = 0.7 + \phi$ .
$1.2(0.4 + \phi) = 0.7 + \phi \Rightarrow 0.48 + 1.2\phi = 0.7 + \phi$
$0.2\phi = 0.22 \Rightarrow \phi = 1.1$ eV
So the answer is (b) 1.1 eV.

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