Menimu distance foll a sound replanting surface to your and echo should be.....................?
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I guess your question is "Minimum distance for you and a sound reflecting wall to hear an echo should be? "
Answer: 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.
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