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azatkgz
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Homework Statement
One of the most prominent spectral lines of hydrogen is [tex]H_\alpha[/tex] line.A bright red light with wavelength of [tex]656.1\times 10^{-9}m[/tex].What's the expected wavelength of the [tex]H_\alpha[/tex] line from a star receding with a speed of 3000 km/s?
The Attempt at a Solution
Is it just [tex]\lambda=\lambda_o-\frac{\lambda_ov}{c}[/tex]