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The rms value of the electric field of the light coming from the Sun is $720 \mathrm{~N} / \mathrm{C}$. The average total energy density of the electromagnetic wave is
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The correct answer is:
$4.58 \times 10^{-6} \mathrm{~J} / \mathrm{m}^3$
$4.58 \times 10^{-6} \mathrm{~J} / \mathrm{m}^3$
$U_{a v}=\varepsilon_0 E_{\text {rs }}^2=4.58 \times 10^{-6} \mathrm{~J} / \mathrm{m}^3$
$E_{\text {rms }}=4.58 \times 10^{-6} \mathrm{~J} / \mathrm{m}^3$
$E_{\text {rms }}=4.58 \times 10^{-6} \mathrm{~J} / \mathrm{m}^3$
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