Optics Question 263

Question: A heavenly body is receding from earth such that the fractional change in l is 1, then its velocity is

[DCE 2000]

Options:

A) C

B) $ \frac{3C}{5} $

C) $ \frac{C}{5} $

D) $ \frac{2C}{5} $

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Answer:

Correct Answer: A

Solution:

$ \frac{\Delta \lambda }{\lambda }=\frac{v}{c}\Rightarrow 1=\frac{v}{c}\Rightarrow v=c $



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