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A star is moving away from the earth wit...

A star is moving away from the earth with a velocity of `100 km//s`. If the velocity of light is `3 xx 10^(8) m//s` then the shift of its spectral line of wavelength `5700 A` due to Doppler effect is

A

`1.90Å`

B

`3.80Å`

C

`5.70Å`

D

None of these

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The correct Answer is:
A
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