Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 12 - Sound - Problems - Page 355: 47

Answer

28.5 kHz

Work Step by Step

The beat frequency is 5 kHz. The other whistle differs in frequency from 23.5 kHz by $\pm5kHz$. If the frequency of the Brand X whistle were 5 kHz lower than 23.5 kHz, it would be audible to humans. Therefore, brand X must be 5 kHz higher in frequency than 23.5 kHz. The frequency of the brand X whistle is 28.5 kHz.
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