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A 6000 Å H(beta) line emitted by hydroge...

A 6000 Å `H_(beta)` line emitted by hydrogen in a star is observed to be red shifted by 10 Å. Find the speed with which star is receding away from the earth.

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`-(Deltalambda)/lambda=V_"radical"/c`
`Deltalambda`=10 Å
`lambda`=6000 Å
c=`3xx10^8` m/s
v=`5xx10^5` m/s
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