What minimum distance is required between the source of sound and the reflecting surface to hear an echo? Give reason.
Sound
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Question

What minimum distance is required between the source of sound and the reflecting surface to hear an echo? Give reason.

KnowledgeBoat · Accepted Answer

The minimum distance required between the source of sound and the reflecting surface to hear an echo is 16.5 m. Speed of sound in air is 330 m s^-1 and the time interval needed to identify two different sounds is 0.1 s, so sound will travel a distance of 330 x 0.1 = 33 m. Since sound has to travel an equal distance in going up to the reflecting surface and in coming back from the reflecting surface, so it must travel nearly = 16.5 m either way.

Physics

What minimum distance is required between the source of sound and the reflecting surface to hear an echo? Give reason.

Sound

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