A fish finder uses a sonar device that sends 20,000Hz sound pulses downward from the bottom of

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A fish finder uses a sonar device that sends 20,000Hz sound pulses downward from the bottom of the boat, and then detects echoes. If the maximum depth for which it is designed to work is 200m, what is the minimum time between pulses (in fresh water)?
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Physics

ISBN: 978-0077339685

2nd edition

Authors: Alan Giambattista, Betty Richardson, Robert Richardson

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