Conceptual Physics (12th Edition)

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

Chapter 19 - Think and Explain: 78


There is no appreciable Doppler effect when the source moves at right angles to the line initially connecting the source and the listener.

Work Step by Step

The distance between the source and the listener is changing, but at a much slower rate than when the source moves directly away from or straight toward the listener. There is no "appreciable Doppler effect". (There is a transverse Doppler effect, but that is a more advanced topic.)
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