An electromagnetic wave having frequency...

An electromagnetic wave having frequency `4 xx 10^(14)Hz` is passing through a small volume. The energy contained in this volume oscillates with frequency.

0Hz

`4 xx 10^(14)Hz`

`8 xx 10^(14)Hz`

`2 xx 10^(14)Hz`

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The correct Answer is:

Frequency of an oscillation of energy with time is twice of frequency of electromagnetic wave.
`:. f` (energy oscillations) `= 2 xx 4 xx 10^(14)Hz`
`= 8 xx 10^(14)Hz`

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