A) 2.5 km/s
B) 10 km/s
C) 5 km/s
D) 20 km/s
Correct Answer: C
Solution :
\[\frac{\Delta \lambda }{\lambda }=\frac{v}{c}\ \therefore v=\frac{\Delta \lambda }{\lambda }c=\frac{0.1}{6000}\times 3\times {{10}^{5}}km/s=5\ km/s\]
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