Optics Question 264

Question: The 6563AA line emitted by hydrogen atom in a star is found to be red shifted by 5AA . The speed with which the star is receding from the earth is

[Pb. PMT 2002]

Options:

A) 17.29 - 109 m/s

B) 4.29 - 107 m/s

C) 3.39 - 105 m/s

D) 2.29 - 105 m/s

Show Answer

Answer:

Correct Answer: D

Solution:

Δλλ=vcv=Δλλ.c

=56563×(3×108)=2.29×105 m/sec



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