Question

When light is made incident on a surface, then photoelectrons are emitted from it. The kinetic energy of photoelectrons

• A. Depends on the wavelength of incident light
• B. Is same
• C. Is more than a certain minimum value
• D. None of these

Answer 1

The correct option is A Depends on the wavelength of incident light

The photoelectric effect related with the incident light frequency $\left(\nu \right)$ by the following equation:
$E_k=e{V}_s=h\nu -\varphi$,
where, $\varphi$ is the work function of the material and $E_k$ is the kinetic energy of the photo electron. So the photoelectrons emitted from the surface of sodium metal are of speeds from zero to a certain maximum depending on the incident photon energy. So, the kinetic energy of photoelectrons depends on the wavelength of incident light.

So, the answer is option (A).