First slide

Average energy density of electromagnetic wave

Question

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

Moderate

A

$3.3 x 10^{- 3} J m^{- 3}$
B

$4.58 x 10^{- 6} J m^{- 3}$
C

$6.37 x 10^{- 9} J m^{- 3}$
D

$81.35 x 10^{- 12} J m^{- 3}$

Solution

total energy density of EM wave $ε_{0} {(E_{r m s})}^{2} = 8.85 x 10^{- 12} x {(720)}^{2} = 4.58 x 10^{- 6}$

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