Answer
One wave can cancel another if they are identical, and $180^{\circ}$, or $\pi$ radians, out of phase with each other.
Work Step by Step
This is discussed on page 384, and shown in Figures 20.17c and 20.17d.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 20 - Reading Check Questions (Comprehension) - Page 388: 25
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