The energy of an electromagnetic wave contained in a small volume oscillates with

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The energy of an electromagnetic wave contained in a small volume oscillates with

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zero frequency

half the frequency of the wave

double the frequency of the wave

the frequency of the wave

answer is C.

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Detailed Solution

$Energy density = u = \frac{1}{2} ϵ_{0} E^{2} When E = E_{0} \sin (ωt - kx) \begin{array}{l} E^{2} = E_{0}^{2} \sin^{2} (ωt - kx) \\ E^{2} = E_{0}^{2} [\frac{1 - \cos 2 (ωt - kx)}{2}] \end{array}$

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