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In an electromagnetic wave, the amplitude of electric field is `1 V//m`. The frequency of wave is `5xx10^(14)Hz`. The wave is propagating along `z`-axis. The average energy density of electric field, in `"joule"//m^(3)`,will be

A

`35.2 xx 10^(-12)J//m^(3)`

B

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

C

`35.2 xx 10^(-11)J//m^(3)`

D

`35.2 xx 10^(-13)J//m^(3)`

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The correct Answer is:
A
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