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Question

The rms value of the electric field of the light coming from sun is 720 N C1. The average total energy density of the electromagnetic wave is
  1. 3.3103Jm3
  2. 4.58106Jm3
  3. 6.37109Jm3
  4. 81.351012Jm3

A
6.37109Jm3
B
81.351012Jm3
C
3.3103Jm3
D
4.58106Jm3
Solution
Verified by Toppr

Given: The RMS value of the electric field of light is 720 N/C.

Energy density of electromagnetic wave is given by:
E=ϵ0E2rms

=8.85×1012×(720)2

E4.58×106J/m3

Option (B) is corret.

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