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 - General Problems - Page 357: 71

Answer

0.12 s

Work Step by Step

If pulses were to be sent out too frequently, a pulse would return before the next one was sent. The minimum time between pulses is the time it takes a pulse to make a round trip, down and back, to a depth of 85 m. The speed of sound in fresh water is 1440 m/s. $$t=\frac{d}{v}=\frac{170m}{1440m/s}=0.12s$$
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