Due to Doppler effect , the shift i...

Due to Doppler effect , the shift in wavelength observed is `0.1 Å` , for a star producing a wavelength 6000 Å . The velocity of recission of the star will be

`20 Km . S^(-1) `

`2.5 km . S^(-1)`

`10 km . S^(-1)`

`5 km . S^(-1)`

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