16. The effect of a given sound lasts on the human ear for about 0.1 second. Use this fact, along with a knowledge on the speed of sound (=300 ms"') to estimate the minimum distance of the reflecting object for getting a clear and distinct echo.
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Speed of sound = v = 340 meters /second in air at normal temperature and weather conditions. ... So the time difference between hearing of the sounds one directly and one reflected - has to be at least 0.1 sec. In this time duration sound travels = 340 m/sec * 0.1 sec = 34 meters
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