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  4. The work function of a photosensitive material is 4.0 eV. This longest wavelength of light that can cause photon emission from the substance is (approximately)

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Q. The work function of a photosensitive material is 4.0 eV. This longest wavelength of light that can cause photon emission from the substance is (approximately)

NEETNEET 2019Dual Nature of Radiation and Matter

Solution:

$\phi = \frac{hc}{\lambda}$
$\Rightarrow 4\,eV = \frac{1240}{\lambda}$
$\Rightarrow = \frac{1240}{4} = 310 \,nm$