Conceptual Physics (12th Edition)

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

Chapter 35 - Think and Explain - Page 684-685: 73

Answer

See below.

Work Step by Step

The new feature is that c is the same for all observers, according to Einstein's second postulate. This means that for a moving light source, the frequency and the wavelength are not constant for all observers, though their product, c, is the same.
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