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The rms value of the electric field of a plane electromagnetic wave is \( 314 \mathrm{~V} / \mathrm{m} \). The average energy density of electric field and the average energy density are
(a) \( 4.3 \times 10^{-7} \mathrm{Jm}^{-3} ; 2.15 \times 10^{-7} \mathrm{Jm}^{-3} \)
(b) \( 4.3 \times 10^{-7} \mathrm{Jm}^{-3} ; 8.6 \times 10^{-7} \mathrm{Jm}^{-3} \)
(c) \( 2.15 \times 10^{-7} \mathrm{Jm}^{-3} ; 4.3 \times 10^{-7} \mathrm{Jm}^{-3} \)
(d) \( 8.6 \times 10^{-7} \mathrm{Jm}^{-3} ; 4.3 \times 10^{-7} \mathrm{Jm}^{-3} \)
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