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 ×10-6 J/m3 (B) 6.37 ×10-9 J/m3 (C) 81.35 ×10-12 J/m3 (D) 3.3 ×10-3 J/m3

Tardigrade Admin · Accepted Answer

Total average energy =ε0E2rms =8.85 ×10-12 ×(720)2 =4.58×10-6 j/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 :

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

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

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

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

Total average energy $= ε_{0} E_{r m s}^{2}$
$= 8.85 \times 1 0^{- 12} \times (720)^{2}$
$= 4.58 \times 1 0^{- 6} j / m^{3}$

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

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

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

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

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

Total average energy $= ε_{0} E_{r m s}^{2}$
$= 8.85 \times 1 0^{- 12} \times (720)^{2}$
$= 4.58 \times 1 0^{- 6} j / m^{3}$