maxium number of echoes per second. please answer this question
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The human ear cannot distinguish echo from the original direct sound if the delay is less than 1/10 of a second.
The velocity of sound in dry air is approximately 343 m/s at a temperature of 25 °C. Therefore, the reflecting object must be more than 17.2m from the sound source for echo to be perceived by a person located at the source.
When a sound produces an echo in two seconds, the reflecting object is 343m away.
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