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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

` 2 xx 10^(8) m//s `

B

` 2 xx 10^(7) m//s `

C

` 2 xx 10^(6) m//s `

D

` 2 xx 10^(5) m // s `

Text Solution

Verified by Experts

The correct Answer is:
B
Speed (v) ` = (c Delta lambda)/( lambda) = ( 3 xx 10^(8) (706 - 656))/( 656)`
`= (1500)/( 656) xx 10^(7) = 2 xx 10^(7) m//s `
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