A) \[f\]
B) \[f\]/2
C) 2\[f\]
D) zero
Correct Answer: C
Solution :
Let the shift in frequency \[=\Delta n\] \[\Delta n=100\times {{10}^{3}}Hz\] v = relative speed Then, \[\frac{\Delta n}{n}=2\frac{v}{c}\] \[v=\frac{\Delta n}{2n}c\] \[=\frac{100\times {{10}^{3}}\times 3\times {{10}^{8}}}{2\times 500\times {{10}^{6}}}\] = 3000 m/s = 3 km/s
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