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Q.

The apparent wavelength of light from a star moving away from the earth in 0.02 % more than the actual wavelength. The velocity of star is:

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a

30Kms–1

b

60Kms–1

c

90Kms–1

d

none

answer is B.

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Detailed Solution

Δλλ=vc;0.02100=v3×108v=3×108×2×10-4 ms−1=60 kms−1

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The apparent wavelength of light from a star moving away from the earth in 0.02 % more than the actual wavelength. The velocity of star is: