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The 6563 A hla line emitted by hydrogen in a star isfound to be red-shifted by 15 A. The speed with whichthe star is receding from the earth is(a) 3.2 × 105 m s(c) 2 x 105 m s1CL(b) 6.87 x 10 m s-1(d) 12.74 x 105 m sl-1

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