How fast (as a percentage of light speed) would a star have to he moving so that

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How fast (as a percentage of light speed) would a star have to he moving so that the frequency of the light we receive from it is 10.0% higher than the frequency of the light it is emitting? Would it he moving away from us or toward us? (Assume it is moving either directly away from us or directly toward us.)
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Physics

ISBN: 978-1118486894

10th edition

Authors: David Young, Shane Stadler

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