First slide

Average energy density of electromagnetic wave

Question

In an electromagnetic wave, the amplitude of electric field is 1V/m. The frequency of wave is $5 x 10^{14} H z$ . The wave is propagating along z-axis.The average energy density of electric field, in Joule/m3, will be

Moderate

A

$1.1 z 10^{- 12}$
B

$2.2 z 10^{- 12}$
C

$4.4 x 10^{- 12}$
D

$6.4 x 10^{- 12}$

Solution

average energy density is $\frac{1}{2} ε_{0} {E^{2}}_{r m s^{}}$ due to electric field

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