Conceptual Physics (12th Edition)

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

Chapter 19 - Think and Explain: 74

Answer

The received frequency is higher than the emitted frequency.

Work Step by Step

The wall "hears" a higher tone than the bat emits because of the Doppler effect (the source, the bat, is approaching the listener, the wall). The wall reflects that higher frequency, and the bat hears an even higher tone than that, again due to the Doppler effect (because the listener, the bat, is approaching the source).
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