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What is an Echo?

Sound that has been reflected is called an echo.
Sound reflection best occurs from flat, hard surfaces.

The natural echo of a room is called reverberation.
Reverberation is a measure of how much the sound is
reflected around the room. Materials that are soft and uneven
(like curtains, carpets and cushions) absorb sound
much more than they reflect it, and decrease reverberation.

Reflected sound (as ultrasound) is used for
range and direction finding, scanning and cleaning.

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