The rms values of the electric field of the light coming from sun is 1000 N/C. The average energy density of the EM wave is _____$\times$10^–6 J/m³

In electromagnetic waves, electric energy density is equal to magnetic energy density. 
Total energy density = 2 $\times$ electric energy 
$\begin{array}{l}=2\left(\frac{1}{4}{\epsilon }_0{{\mathrm{E}}_0}^2\right)\\ =\frac{1}{2}\times 8.854\times {10}^{-12}\times (1000\sqrt{2}{)}^2\\ =8.854\times {10}^{-6}\mathrm{J}/{\mathrm{m}}^3\end{array}$