Answer
Bats.
Work Step by Step
The wave speed (i.e., the speed of sound) is frequency multiplied by wavelength. Higher frequencies of sound, those heard by bats, correspond to shorter wavelengths.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 20 - Think and Explain - Page 389-390: 48
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