Suppose a spectral line of hydrogen, normally at 5 0 0 nm , is observed in the spectrum of a star to be 5 0 0 1 nm How fast is the star moving toward or away from Earth

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Suppose a spectral line of hydrogen, normally at 5 0 0 nm , is observed in the spectrum of a star to be 5 0

Suppose a spectral line of hydrogen, normally at

500

,

is observed in the spectrum of a star to be

500.1

.

How fast is the star moving toward or away from Earth?

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