A) \[1.2\ f,\ \lambda \]
B) \[f,\ 1.2\lambda \]
C) \[0.8f,\ 0.8\lambda \]
D) \[1.2f,\ 1.2\lambda \]
Correct Answer: A
Solution :
\[n'=\frac{v+{{v}_{0}}}{v}.n=\frac{v+\frac{v}{5}}{v}.f=\frac{6}{5}f=1.2f\] and since the source is stationary, so wave length remains unchanged for observer.
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