Physics - Modern Physics Question with Solution | TestHub

$\text{Number of ejected electrons}\propto \left(\text{Intensity}\right)\propto \frac{1}{{\left(\text{Distance}\right)}^2}$

Therefore an increment of distance two times will reduce the number of ejected electrons to$\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$4^{\mathrm{th}}$}\right.$of the previous one.