The $rms$ value of the electric field of the light coming from the sun is $720 \ N \ C^{-1}$. The average energy density of the electromagnetic wave is $...... \ J \ m^{-3}$.
- A$4.58 \times 10^{-6}$
- B$8.45 \times 10^{-6}$
- C$4.58 \times 10^{-4}$
- D$8.45 \times 10^{-4}$
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