A rocket is going away from the earth at a speed 0.2c, where c = speed of light. It emits a signal of frequency \[4\times {{10}^{7}}Hz\]. What will be the frequency observed by an observer on the earth [RPMT 1996]

A rocket is going away from the earth at a speed 0.2c, where c = speed

1.	A rocket is going away from the earth at a speed 0.2c, where c = speed of light. It emits a signal of frequency \[4\times {{10}^{7}}Hz\]. What will be the frequency observed by an observer on the earth [RPMT 1996]
A.	\[4\times {{10}^{6}}Hz\]
B.	\[3.2\times {{10}^{7}}Hz\]
C.	70 km to 100 km
D.	\[5\times {{10}^{7}}Hz\]
Answer» C. 70 km to 100 km

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A rocket is going away from the earth at a speed 0.2c, where c = speed of light. It emits a signal of frequency \[4\times {{10}^{7}}Hz\]. What will be the frequency observed by an observer on the earth [RPMT 1996]

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