What is the Doppler shift in the wavelength of Hα ( 656.1 nm ) line from a star which is moving away from the earth with a velocity of 300 km/s ?

Stars and Galaxies (MindTap Course List)
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Chapter7: Atoms And Spectra
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What is the Doppler shift in the wavelength of Hα ( 656.1 nm ) line from a star which is moving away from the earth with a velocity of 300 km/s ? 

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