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depth of the lake

At a height of 5 meters above the surface of a freshwater lake, a sound pulse is generated. The echo from the bottom of the lake returns to the point of origin 0.140 s later. The air and water temperatures are 20°C. How deep is the lake?

Solution Preview

At 20°C, the speed of the sound in air is 343 m/s. Speed in water is 1482 m/s.

The sound ...

Solution Summary

The solution shows how to determine the depth of the lake using the sound and its echo.