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In hydrogen spectrum the wavelength of H...

In hydrogen spectrum the wavelength of `H_(a)` line is `656nm, ` where in the spectrum of a distance galaxy `H_(a)` line wavelength is `706 nm` . Estimated speed of the galaxy with respect to earth is ,

A

`2xx10^(8)m//s`

B

`2xx10^(7)m//s`

C

`2xx10^(6)m//s`

D

`2xx10^(5)m//s`

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