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Old 15-04-2003, 09:43 PM #3
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Mairi Mairi is offline
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Join Date: Oct 2002
Location: The Wirral
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Or to put it more simply, Sticks:

When two sound waves of different frequency approach your ear, the alternating constructive and destructive interference causes the sound to be alternatively soft and loud - a phenomenon which is called "beating" or producing beats. The beat frequency is equal to the absolute value of the difference in frequency of the two waves.

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