Question: Consider an electromagnetic wave impinging on an electron. It is easy to show kinematically that the average value of the time rate-of-change of the electrons

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

1 / dW ()-:(

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

(S(t))T (P(t))r (3.51)

1 / dW ()-:("); dt dt (S(t))T (P(t))r (3.51)

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