The root-mean-square (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

Question

The root-mean-square (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 (A) 4.58× 10- 6Jm- 3 (B) 6.37× 10- 9Jm- 3 (C) 81.35× 10- 12Jm- 3 (D) 3.3× 10- 3Jm- 3

Tardigrade Admin · Accepted Answer

Total average energy =ϵ 0Er m s2 =8.85× 10- 12× 720 2

Q. The root-mean-square (RMS), value of the electric field of the light coming from the sun is $720 N C^{- 1} .$ The average total energy density of the electromagnetic wave is

$4.58 \times 1 0^{- 6} J m^{- 3}$

$6.37 \times 1 0^{- 9} J m^{- 3}$

$81.35 \times 1 0^{- 12} J m^{- 3}$

$3.3 \times 1 0^{- 3} J m^{- 3}$

Total average energy $= ϵ_{0} E_{r m s}^{2}$
$= 8.85 \times 1 0^{- 12} \times 72 0^{2}$

Q. The root-mean-square (RMS), value of the electric field of the light coming from the sun is 720NC−1. The average total energy density of the electromagnetic wave is

4.58×10−6Jm−3

6.37×10−9Jm−3

81.35×10−12Jm−3

3.3×10−3Jm−3