In an electromagnetic wave, the amplitud...

In an electromagnetic wave, the amplitude of electric firld 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

`2.2xx12^(-12)`

`4.4XX10^(-12)`

`6.6XX10^(12)`

`8.8XX10^(-12)`

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