A) C
B) \[\frac{3C}{5}\]
C) \[\frac{C}{5}\]
D) \[\frac{2C}{5}\]
Correct Answer: A
Solution :
\[\frac{\Delta \lambda }{\lambda }=\frac{v}{c}\Rightarrow 1=\frac{v}{c}\Rightarrow v=c\]
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