The average intensity of an electromagnetic wave is given by the formula:
$I = \frac{1}{2} c \epsilon_0 E_{max}^2 = \frac{E_{max}^2}{2 \mu_0 c}$
where $c$ is the speed of light in vacuum, $\epsilon_0$ is the permittivity of free space, and $\mu_0$ is the
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