The rms value of the electric field of the light coming from the sun is 720 N/C. The average total energy density of the electromagnetic wave is

Question

The rms value of the electric field of the light coming from the sun is 720 N/C. The average total energy density of the electromagnetic wave is (A)  4.58× 10-6J/m3  (B)  6.37× 10-9J/m3  (C)  81.35× 10-12J/m3  (D)  3.3× 10-3J/m3

Tardigrade Admin · Accepted Answer

Total average energy =ε 0Erms2 =8.85× 10-12× (720)2 4.58× 10-6J/m3

Q. The rms value of the electric field of the light coming from the sun is 720 N/C. The average total energy density of the electromagnetic wave is

$4.58 \times 10^{- 6} J / m^{3}$

$6.37 \times 10^{- 9} J / m^{3}$

$81.35 \times 10^{- 12} J / m^{3}$

$3.3 \times 10^{- 3} J / m^{3}$

Total average energy
$= ε_{0} E_{r m s}^{2}$
$= 8.85 \times 10^{- 12} \times (720)^{2}$
$4.58 \times 10^{- 6} J / m^{3}$

Q. The rms value of the electric field of the light coming from the sun is 720 N/C. The average total energy density of the electromagnetic wave is

4.58×10−6J/m3

6.37×10−9J/m3

81.35×10−12J/m3

3.3×10−3J/m3

Total average energy =ε0​Erms2​ =8.85×10−12×(720)2 4.58×10−6J/m3

$4.58 \times 10^{- 6} J / m^{3}$

$6.37 \times 10^{- 9} J / m^{3}$

$81.35 \times 10^{- 12} J / m^{3}$

$3.3 \times 10^{- 3} J / m^{3}$

Total average energy
$= ε_{0} E_{r m s}^{2}$
$= 8.85 \times 10^{- 12} \times (720)^{2}$
$4.58 \times 10^{- 6} J / m^{3}$