In the photoelectric phenomenon if the ratio of the frequency of incident radiation incident on a photosensitive surface is 1:2:3, the ratio of the photoelectric current is
$\begin{gathered}
  {\text{A) 1:2:3}} \\
                                        {\text{B) }}\sqrt {\text{1}} {\text{:}}\sqrt {\text{2}} {\text{:}}\sqrt {\text{3}} \\
  {\text{C) 1: 4: 9}} \\
  {\text{D) 1:1:1}} \\
\end{gathered} $

Hint: For a given metal the rate at which photoelectrons are ejected is directly proportional to the intensity of the incident light.

Complete step by step solution
The emitted electrons are called photoelectrons and the current produced thus is called photoelectric current .As the photoelectric current is independent of the frequency of incident radiation so the photo electric current will be the same for each incident frequency. Thus, the photoelectric current will be ${\text{1:1:1}}$.

Additional information: The phenomenon of emission of photoelectrons from the surface of metal, when a light beam of required frequency is incident on it, is called photoelectric effect.

Notes: The photons of a light beam have a characteristic energy, called photon energy, which is proportional to the frequency of the light. Below that threshold, no electrons are emitted from the material, regardless of the light intensity or the length of time of exposure to the light.