state a condition for an echo to be heard?
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When we are standing on a short room and it was completely empty then we hear echo sound
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distance between source of sound and reflector is more than 16.6m
source's height is less than height of reflector
reflected sound should reach after 0.1s (persistence of hearing)
source's height is less than height of reflector
reflected sound should reach after 0.1s (persistence of hearing)
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