Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 35 - Reading Check Questions (Comprehension): 19

Answer

When the source is moving away from you at that speed, the time interval between flashes is measured to be twice as long, compared to when the source is at rest.

Work Step by Step

This is discussed on page 669, and shown in Figures 35.15-35.16.
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