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.            \[3\times {{10}^{6}}Hz\] 
D.            \[5\times {{10}^{7}}Hz\]
Answer» C.            \[3\times {{10}^{6}}Hz\] 


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