Question

Clacuate minimum distance to hear eco?​

Answer 1

Answer:

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Answer 2

Answer:

The total distance between a sound source and the reflector is twice that. So, if the obstacle is at least 17 m away, then after 0.1 second, the reflected sound or the echo is clearly detected. Hence, to hear a clear echo, the minimum distance between the reflecting surface and the observer is 17 m.

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