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NEET 2019 · Photoelectric Effect: Einstein's Equation

Photoelectric Effect: Einstein's Equation question from NEET 2019

Q127NEET 2019Easy

Photoelectric Effect: Einstein's Equation

The work function of a photosensitive material is $4.0\text{ eV}$ . The longest wavelength of light that can cause photon emission from the substance is (approximately)

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Answer: (a)

Longest wavelength = threshold: $\lambda_0 = \dfrac{hc}{\phi} = \dfrac{1240\text{ eV nm}}{4.0\text{ eV}}$
$\lambda_0 = 310\text{ nm}$
So the answer is (a) 310 nm.

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