A) 2 km/s
B) 3 km/s
C) 4 km/s
D) 5 km/s
Correct Answer: B
Solution :
Let the shift in frequency\[=\Delta n\] \[\Delta n=100\times {{10}^{3}}Hz\] \[\upsilon =\]relative speed Then, \[\frac{\Delta n}{n}=2\frac{\upsilon }{c}\] \[\upsilon =\frac{\Delta n}{2n}c\] \[=\frac{100\times {{10}^{3}}\times 3\times {{10}^{8}}}{2\times 5000\times {{10}^{6}}}\] \[=3000\text{ }m/s\] \[=3km/s\]
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