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the method for detecting things with sound is called as SONAR-sound navigation and radiation. in this mehod we need to know the speed of sound in that medium. and as we have the relation that speed=distance*time, we can use a detector-to know that the sound that we sent has returned and stopcock to get the time. the distance we get should be divided by 2 so as to get the distance of the object from the source.

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