Sound travels in waves and bounces off hard surfaces just like light bounces off mirrors. When sound reflects back to us and we hear it again, that is
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What is an echo?
An echo is the sound heard again after it reflects off a hard surface such as a wall or hill and returns to the listener a short time after the original sound.
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What is the minimum distance needed to hear an echo?
To hear a distinct echo the reflecting surface must be at least about 17 metres away, so the reflected sound returns after at least 0.1 second (the persistence of hearing).
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What is the difference between an echo and reverberation?
An echo is a single, clearly separated repetition of sound. Reverberation is the persistence of sound caused by repeated reflections in a closed space such as a large hall, heard as a prolonged blur rather than a distinct repeat.
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