The rms value of the electric field of the light coming from the sun is 720 NC-1. The average total energy density of the Electromagnetic Wave is

4.58 × 10−6 Jm−3 6.37 × 10−9 Jm−3 81.35 × 10−12 Jm−3 3.3 × 10−3 Jm−3

4.58 × 10−6 Jm−3

Total average energy $ = ε_0E^2_{rms}$ $ = 8.85 × 10^{-12} ×(720)^2$ $ = 4.58 × 10^{-6} Jm^{-3}$