Question: For the electromagnetic wave represented by Eq. (32.19), show that the Poynting vector (a) Is in the same direction as the propagation of the wave

For the electromagnetic wave represented by Eq. (32.19), show that the Poynting vector
(a) Is in the same direction as the propagation of the wave and
(b) Has average magnitude given by Eqs. (32.29).

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