On Tue, May 12, 2009 at 10:21 AM, <afmamh7 at bellsouth.net> wrote: > I am not an acoustician, but I think it is incorrect to consider sound and > vibration as two different types of energy. Sound IS vibration. > > > Sound is not vibration. Sound is an impulse that is a wave of air. It > leaves from it's point of origin and never goes back unless acted upon by > another force. It is confusing that it does have frequency and amplitude. > Take the wave pattern caused by dropping a rock in a pond. The resultant > waves have direction, amplitude and frequency but we don't call it > vibration. Sound originates from a point source and disperses in the same > manner as the water waves do. > In vibration, the energy returns and crosses the center line of origin. > Back and forth motion is vibration. Keith Roberts -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/caut.php/attachments/20090513/8637894f/attachment-0001.htm>
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