For a specific wavelength 670 nm of ligh...

For a specific wavelength 670 nm of light coming from a galaxy moving with velocity v , the observed wavelength is `670.7` nm .

`3 xx 10^(8) "ms"^(-1)`

`3 xx 10^(10) "ms"^(-1)`

`3.13 xx 10^(5) " ms"^(-1)`

`4.48 xx 10^(5) "ms"^(-1)`

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