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Physics 13 Online
OpenStudy (anonymous):

explain why echoes are undesirable in big halls.

OpenStudy (kropot72):

Echoes are the result of reverberation, where the reflected sounds from the surfaces of an enclosed space are united. When the path lengths of these sounds differ significantly the intelligibility of speech is reduced. There is a diagram and more explanation here: http://hyperphysics.phy-astr.gsu.edu/hbase/acoustic/reverb.html

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