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6563 Å Hα line emitted by hydrogen in a star is found to be red-shifted by 15 Å. Estimate the speed with which the star is receding from the Earth.

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6563 Å Hα line emitted by hydrogen in a star is found to be red-shifted by 15 Å. Estimate the speed with which the star is receding from the Earth.

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Given: λ0 = 6563 Å = 6.563 x 10-7 m

To find: Speed (v)

\(\therefore\) v = 6.86 x 105 m s-1

The speed with which the star is receding from earth is 6.86 x 105 m s-1.

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