Conceptual Physics (12th Edition)

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

Chapter 29 - Think and Explain: 32

Answer

Both of the phenomena can be explained by wave interference.

Work Step by Step

The varying light/sound intensity is the result of the superposition of waves. When a viewer/listener is located at different distances from each source, waves arrive from each source with different phases. They can interfere either constructively or destructively. This is discussed on pages 549-550, and illustrated in Figure 29.18.
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