The maximum electric field of a plane electromagnetic wave is \( 88 \mathrm{~V} / \mathrm{m} \)....

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The maximum electric field of a plane electromagnetic wave is \( 88 \mathrm{~V} / \mathrm{m} \). The average energy density is
(a) \( 3.4 \times 10^{-8} \mathrm{Jm}^{-3} \)
(b) \( 13.7 \times 10^{-8} \mathrm{Jm}^{-3} \)
(c) \( 6.8 \times 10^{-8} \mathrm{Jm}^{-3} \)
(d) \( 1.7 \times 10^{-8} \mathrm{Jm}^{-3} \)
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