Conceptual Physics (12th Edition)

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

Chapter 19 - Reading Check Questions (Comprehension): 22

Answer

A blue shift for light refers to the Doppler effect shifting the received light toward shorter wavelengths (the blue end of the visible spectrum). A blue shift occurs when the source and the observer approach each other. A red shift for light refers to the Doppler effect shifting the received light toward longer wavelengths (the red end of the visible spectrum). A red shift occurs when the source is receding (moving away) from the observer, or the observer is moving away from the source.

Work Step by Step

This is discussed on page 366.
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