Question

A polychromatic light is used in an experiment on photoelectric effect. The stopping potential

• A. Is related to the mean wavelength
• B. Is related to the longest wavelength
• C. Is related to the shortest wavelength
• D. Is not related to the wavelength.

Answer 1

Answer: (C)

The stopping potential (Vs) in photoelectric effect related with the incident light frequency $\left(\nu \right)$ by the following equation:
$e{V}_s=h\nu -\varphi$,

where $\varphi$ is the work function of the material. So the stopping potential is related to the shortest wavelength or longest frequency.

So, the answer is option (C).