91Ó°ÊÓ

The photoelectric effect is the ejection of surface electrons in a metal when photon strikes. The mathematical expression governing the effect and giving the maximum kinetic energy of the ejected electrons is,

$$\begin{gathered} \mathit{K}\mathbf{.}{\mathit{E}}_{\mathbf{m}\mathbf{a}\mathbf{x}}\mathbf{=}\mathit{h}\mathit{f}\mathbf{-}\mathit{Φ} \\ \mathit{e}{\mathit{V}}_{\mathbf{0}}\mathbf{=}\mathit{h}\mathit{f}\mathbf{-}\mathit{h}{\mathit{f}}_{\mathbf{0}} \end{gathered}$$ ...(i)

Where $\mathrm{Φ}$the work function, hf is the energy of the striking photon, f₀ is the threshold frequency and V₀ is the stopping potential that reduces the current to zero.

One photon strike ejects one electron. Thus by changing the current of the incident photons only changes the magnitude of the photocurrent of the ejected electrons while keeping everything else the same. The maximum kinetic energy and the velocity of photoelectrons only depends on the energy of the incident photons and in this case they remain unchanged. Thus, the number of photoelectrons only is increased to 10 times.