The average energy-density of an electromagnetic wave given by \( E=(50 \mathrm{~N} / \mathrm{C}...

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The average energy-density of an electromagnetic wave given by \( E=(50 \mathrm{~N} / \mathrm{C}) \sin (\omega t-k x) \) will be nearly
(A) \( 10^{-8} \mathrm{~J} / \mathrm{m}^{3} \)
(B) \( 10^{-7} \mathrm{~J} / \mathrm{m}^{3} \)
(C) \( 10^{-6} \mathrm{~J} / \mathrm{m}^{3} \)
(D) \( 10^{-5} \mathrm{~J} / \mathrm{m}^{3} \)
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