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The apparent wavelength of light from a ...

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

A

`30 Kms^(-1)`

B

`60 Kms^(-1)`

C

`90 Kms^(-1)`

D

none of these

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The correct Answer is:
A
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