Consider an electromagnetic wave impinging on an electron. It is easy to show kinematic-al...

Consider an electromagnetic wave impinging on an electron. It is easy to show kinematic-ally that the average value of the time rate-of-change of the electron's momentum  is proportional to the average value of the time rate-of-change of the work, W, done on it by the wave. In particular,

Accordingly, if this momentum change is imparted to some completely absorbing material, show that the pressure is given by Eq. (3.51).