A rocket is going away from the earth at...

A rocket is going away from the earth at a speed 0.2 c , where c = speed of light. It emits a signal of frequency `4 xx 10^(7)Hz` . What will be the frequency observed by an observer on the earth

`4 xx 10^(6) Hz`

`3.2 xx 10^(7) Hz`

`3 xx 10^(6) Hz`

`5 xx 10^(7) Hz`

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