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A star is moving away from the earth at 45.9 km/s. By how much will the...

A star is moving away from the earth at 45.9 km/s. By how much will the Hα line (f = 4.571 1014 Hz) be shifted and in what direction? (Use the sign of your answer to indicate whether it will be shifted to a larger (+) or smaller (−) frequency.)

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