The rms value of the electric field of the light coming from sun is 720 N C−1. The average total energy density of the electromagnetic wave is
3.310−3Jm−3
4.5810−6Jm−3
6.3710−9Jm−3
81.3510−12Jm−3
A
6.3710−9Jm−3
B
81.3510−12Jm−3
C
3.310−3Jm−3
D
4.5810−6Jm−3
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Solution
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Given: The RMS value of the electric field of light is 720N/C.
Energy density of electromagnetic wave is given by:
E=ϵ0E2rms
=8.85×10−12×(720)2
E≈4.58×10−6J/m3
Option (B) is corret.
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