Measuring sound velocity is an important physical experiment. It is possible to know the acoustical characteristics of measured medium by measuring sound velocity.
测量声速是大学物理实验中一个比较重要的实验，通过对声速的测量可以了解被测介质的声学特性。
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For exploring the direction of acoustical emission sources prior to earthquakes, assuming that the sound velocity is only dependent on depth, a formula of sound source direction can be derived.