Essential University Physics: Volume 1 (4th Edition) Clone

Published by Pearson
ISBN 10: 0-134-98855-8
ISBN 13: 978-0-13498-855-9

Chapter 14 - Exercises and Problems - Page 273: 77

Answer

The judge should rule in favor of the police officer.

Work Step by Step

We use the equation for the velocity considering the Doppler effect: $v = \frac{c\Delta f}{2f} = \frac{(10.8\times10^8 \ km/h)(15.6\times10^3 \ Hz)}{2(70\times10^9 \ Hz)} = 120 \ km/h$ The judge should rule in favor of the police officer, for this is the same as the recorded speed.
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