The minimum distance between source of sound and reflecting body to hear an echo is___________.

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Solution

When a sound wave travels in a medium and get reflected back from the reflecting surface, we hear an echo.
The sound wave must travel a minimum distance so that we can hear an echo. Considering the speed of sound in air as $340 m / s$ , the minimum distance between the source of sound and reflecting body is $17.2$ metres.

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