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  4. The work function of a substance is 4.0eV . The longest wavelength of light that can cause photoelectron emission from this substance is approximately

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Q. The work function of a substance is $4.0eV$ . The longest wavelength of light that can cause photoelectron emission from this substance is approximately

NTA AbhyasNTA Abhyas 2022

Solution:

The maximum wavelength which is responsible for emission of photoelectron is
$ \, \lambda _{0}=\frac{h c}{W_{0}}=\frac{1240}{4}$
$= \, 310 \, nm$