In a laboratory a wavelength of a particular hydrogen
In a laboratory, a wavelength of a particular hydrogen emission line (Balmer beta line) is observed as 486.1 nm. If the same emission line appears in a star's spectrum at 486.3 nm, what is the stars radial velocity ? Is it approaching or receding?
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a proton of mass mp and charge qp e deuteron of mass 2mp and charge qd e and alpha particle of mass 4mp and charge qa
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