Optics Question 242

Question: The apparent wavelength of the light from a star moving away from the earth is 0.01% more than its real wavelength. Then the velocity of star is

[CPMT 1979]

Options:

A) 60 km/sec

B) 15 km/sec

C) 150 km/sec

D) 30 km/sec

Show Answer

Answer:

Correct Answer: D

Solution:

Δλλ=vc⇒v=cλΔλ=cλ(λ‘−λ)=c×0.01100

=3×104m/s=30 km/sec

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