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Figure 1a - Here we have a person determining the depth of his water well by dropping a rock into it and recording the time for the splashing sound to come back. After some mathematical manipulation -- and knowing the speed of sound in air -- the person can translate time into depth.
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Figure 1a - Here we have a person determining the depth of his water well by dropping a rock into it and recording the time for the splashing sound to come back. After some mathematical manipulation -- and knowing the speed of sound in air -- the person can translate time into depth.