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
Answer & explanation
Correct answer: option 1
Total average energy $ = ε_0E^2_{rms}$
$ = 8.85 × 10^{-12} ×(720)^2$
$ = 4.58 × 10^{-6} Jm^{-3}$