Conceptual Physics (12th Edition)

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

Chapter 29 - Think and Explain - Page 560-561: 33


By an odd number of half-wavelengths: $\frac{1}{2}$ wavelength, $\frac{3}{2}$ wavelength, $\frac{5}{2}$ wavelength, etc.

Work Step by Step

This is discussed on pages 549-550, and illustrated in Figure 29.12. If one wave is delayed by a half-wavelength, the two waves will arrive out of phase, and cancel each other. Delaying that wave by a whole number of wavelengths on top of the half-wavelength delay doesn't change anything; the two waves will still be out of phase.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.