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The rms value of the electric field of t...

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

A

` 6 . 37 xx 10 ^(-9) J// m^(3)`

B

` 81 . 35 xx 10 ^(-12) J // m^(3)`

C

` 3 . 3 xx 10 ^(-3) J// m ^(3)`

D

` 4 . 58 xx 10 ^(-6) J // m^(3)`

Text Solution

Verified by Experts

The correct Answer is:
D
Average energy density
`= (1)/(2) epsilon_(0) E_(0)^(2) = (1)/(2) epsilon_(0) xx ( sqrt(2) E_("rms"))^(2) = epsilon_(0) E_("rms")^(2)`
`= 8.85 xx 10 ^(-12) xx (720)^(2) = 4 . 58 xx 10^(-6) J//m^(3)`
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