determine the minimum distance between the listener and reflector for an echo to be heard distinctively of a sound propagating with a sperd v m/sec? (v = 340 ms-¹)
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As we know that the perception of a sound usually endures in memory for only 0.1 seconds
so, minimum time for echo = 0.1 sec
distance = d
sound have to travel, from listener to reflector then to listener
so total distance travelled = 2d
now, distance = speed× time = 340 ×0.1
⇒2d = 34
⇒d = 17 m
minimum distance for echo is 17 m
so, minimum time for echo = 0.1 sec
distance = d
sound have to travel, from listener to reflector then to listener
so total distance travelled = 2d
now, distance = speed× time = 340 ×0.1
⇒2d = 34
⇒d = 17 m
minimum distance for echo is 17 m
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