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: 85

Answer

The two ultrahigh frequencies of 102 kHz and 100 kHz interfere, and cause a loudness fluctuation at the beat frequency. The beat frequency is the difference in frequencies, 2 kHz = 2000 Hz, and this is squarely within the range of human hearing (20 - 20,000 Hz).
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