Conceptual Physics (12th Edition)

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

Chapter 19 - Think and Explain - Page 371-372: 79

Answer

Police officers use "radar guns," which emit microwaves and then detect the waves that are reflected from moving vehicles. The shift in the detected microwave frequency, as compared to the emitted frequency, is used to calculate the speed of the vehicle.
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