A star is moving away from earth and shi...

A star is moving away from earth and shift in spectral line of wavelength `5700 Å` is `1.90 Å`. Velocity of the star is :

A

`50kms^(-1)`

B

`70kms^(-1)`

C

`85kms^(-1)`

D

`100kms^(-1)`

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The correct Answer is:

D

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