Conceptual Physics (12th Edition)

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

Chapter 20 - Think and Explain - Page 389-390: 84

Answer

268 Hz or 260 Hz.

Work Step by Step

The beat frequency is the difference between the two frequencies, but we don't know which one is the higher frequency. Because the difference is 4 Hz, the possible piano wire frequencies are 264 Hz + 4 Hz = 268 Hz, or 264 Hz – 4 Hz = 260 Hz.
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