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Waves

Sound - Echo.

Sound which has been reflected is called an echo.
As with other waves, sound reflection best occurs from flat, hard surfaces.

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

Reflected ultrasound is used for range and direction finding,
scanning and cleaning.

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Copyright © 2007 Dr. Colin France. All Rights Reserved.