gc textbook chapter 12 Sound (id: 1f29027b2)

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 bat flies toward a6w i: -wcjr o;yl::jy6mn kls:.zce,q wall at a speed of 5 m/s As it flies1) u5wpdpv ts5, the bat emits an ultrasonic sound wave with frequency 30.0 kHz. What frequency does the bat hear in the re dtwvpp)su515 flected wave?    $ \times10^{4}$ Hz

参考答案: 3,09±2%


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