Question

A non-monochromatic light is used in an experiment on the 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

The correct option is C Is related to the shortest wavelength

For photo electronic effect is observed, wavelength of the incident light $\left(\lambda \right)$ should be less than the threshold wavelength $\left({\lambda }_0\right)$ of the metal.

Eienstein's photoelectric equation,

${eV}_0=\frac{h_c}{{\lambda }_0}-\rho$

It is clear from the above equation that stopping potential is related to the shortest wavelength.