A) 60 km/sec
B) 15 km/sec
C) 150 km/sec
D) 30 km/sec
Correct Answer: D
Solution :
\[\frac{\Delta \lambda }{\lambda }=\frac{v}{c}\Rightarrow v=\frac{c}{\lambda }\Delta \lambda =\frac{c}{\lambda }(\lambda '-\lambda )=c\times \frac{0.01}{100}\] \[=3\times {{10}^{4}}m/s=30\ km/\sec \]
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