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Suppose a rocket is going away from the ...

Suppose 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 ?

A

`4 xx 10^6 Hz`

B

`3.3 xx 10^7 Hz`

C

`3 xx 10^6 Hz`

D

`5 xx 10^7 Hz`.

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