An echo is distinctly heard only if the time interval between original sound and reflected sound is at least about:
0.1 s
The human ear retains a sound sensation for about 0.1 second, a phenomenon called persistence of hearing. For an echo to be heard as a distinctly separate sound rather than blending with the original, the reflected sound must reach the ear at least 0.1 second later, corresponding to a minimum reflecting-surface distance of roughly 17.2 metres in air.
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