In an electromagnetic wave, the amplitude of electric field is 1V/m. The frequency of wave is  5 x 1014 Hz. The wave is propagating along z-axis.The average energy density of electric field, in Joule/m3, will be

# In an electromagnetic wave, the amplitude of electric field is 1V/m. The frequency of wave is  . The wave is propagating along z-axis.The average energy density of electric field, in Joule/m3, will be

1. A

2. B

3. C

4. D

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### Solution:

average energy density is  due to electric field

$=\frac{1}{2}{\epsilon }_{0}{\mathrm{E}}^{2}=\frac{1}{2}{\epsilon }_{0}{\left(\frac{{\mathrm{E}}_{0}}{\sqrt{2}}\right)}^{2}$

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