Fundamentals of Physics Extended (10th Edition)

Published by Wiley
ISBN 10: 1-11823-072-8
ISBN 13: 978-1-11823-072-5

Chapter 37 - Relativity - Problems - Page 1148: 38b

Answer

The relative motion is away from the Earth.

Work Step by Step

The detected light has a longer wavelength than the laboratory wavelength. This means that the light is red-shifted which results when the source-detector separation is increasing. Therefore, the relative motion is away from the Earth.
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