A) \[4\times {{10}^{6}}Hz\]
B) \[3.3\times {{10}^{7}}Hz\]
C) \[3\times {{10}^{6}}\,Hz\]
D) \[5\times {{10}^{7}}Hz\]
Correct Answer: B
Solution :
Apparent frequency \[v=v\left( 1-\frac{\upsilon }{c} \right)\] \[=4\times {{10}^{7}}\left( 1-\frac{0.2c}{c} \right)=3.2\times {{10}^{7}}Hz\]
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