Echoes

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Echoes are caused by the reflection of sound waves by nonabsorbing surfaces some distance away from the source. The speed of sound in air is around 331 meters per second (varying with temperature). To hear a good echo, the round trip traveled by the sound must take at least a perceptible fraction of a second.

Contributed by: Enrique Zeleny (March 2011)
Open content licensed under CC BY-NC-SA


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