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  4. In photoelectric effect, the electrons are ejected from the metal surface, if the incident light has a certain maximum

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Q. In photoelectric effect, the electrons are ejected from the metal surface, if the incident light has a certain maximum

NTA AbhyasNTA Abhyas 2022

Solution:

The photoelectron is emitted from a metal surface if the incident photon possesses a minimum required energy for photoemission, called as the work function.
Hence,
$\frac{h c}{\lambda} \geq \frac{h c}{\lambda_{0}}$
$\lambda \leq \lambda_{0}$
Therefore, if the incident light does not have wavelength greater than the maximum wavelength $\lambda_{0}$ photoelectrons are emitted.