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The apparent wavelength of the light fro...

The apparent wavelength of the light from a star, moving away from the earth, is 0.01% more than its real wave length. The speed of the star with respect to the earth is ……………… .

A

10 km/s

B

15 km/s

C

30 km/s

D

60 km/s

Text Solution

Verified by Experts

The correct Answer is:
C
`(v_(r))/(c) = (Delta lambda)/(lambda)` or `v_(r) = (0.01)/(100) xx 3 xx 10^(8) = 3 xx 10^(4)` m/s = 30 km/s
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