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At rest, hydrogen has a spectral line at 124 nm. If this line is observed at 133
nm for the star Sirius, how fast is Sirius moving in km/s?
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Transcribed Image Text:At rest, hydrogen has a spectral line at 124 nm. If this line is observed at 133 nm for the star Sirius, how fast is Sirius moving in km/s?
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