Minimum distance between the observer and the obstacle for echo to be

1.	Minimum distance between the observer and the obstacle for echo to be heard.
Answer» TANCE between the OBSERVER and the obstacle = dSpeed of sound (in the medium) = vTime after which echo is HEARD = tSpeed of sound in AIR at 20°CFor an echo to be heard distinctly, Thus, the minimum distance (in air at 20°C ) between the observer and the obstacle for the echo to be heard CLEARLY should be 17.2 m.

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Minimum distance between the observer and the obstacle for echo to be heard.​

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Minimum distance between the observer and the obstacle for echo to be heard.