Question

Light of wavelength λ strikes on a metal surface with intensity x and metal emits y electrons per second of average energy z. what will happen to y and z if x is doubled?

Answer 1

The value of y will be doubled and the value of z does not changes if the value of x is doubled.

• The relation between the average energy and intensity is

                  $z=\frac{hc}{\lambda}- w_{0}$

• The average energy emmited (z) is independent on the intensity of the light so the value of z does not changes on  changing the value of x.

• Rate of emission per second (y) varies linearly with the value of x, on changing the value of x the value of y will also be doubled