gc textbook chapter 12 Sound (id: 8869e7596)

本题目来源于试卷: gc textbook chapter 12 Sound，类别为 通用国际物理

[填空题]
A fish finder uses a sonar dev,4 p.j +aj oohoj/b9 mrmny1*dice that5y5 4pphtit 9f sends 20,000-Hz sound pulses downward from the bottom of the boat, and thenf yp9i4ptth55 detects echoes. If the maximum depth for which it is designed to work is 200 m, what is the minimum time between pulses (in fresh water)?    s

参考答案: 0.28±2%


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