In Reply to: RE: if I may guess posted by kyle on May 27, 2015 at 10:11:34:
I think you guys are confusing the speed of sound, how fast a sound moves through air, to the speed of vibration of the air molecules making up the sound.
Air molecules vibrate back and forth, faster with higher frequency, to produce sound and this is not the same as the constant speeed of sound ~344 m/sec in air. In acoustics when describing the vibration of the air you usually use volume velocity which is a cross-sectional area times the velocity of the vibrating air. So for example a port or driver has a volume velocity that is the circular cross-sectional area times the vibratory velocity (or the back and forth dispacement of the air molecules times the frequency of vibration).
You need to keep velocity of sound and velocity of the vibrating air molecules as two different actions that transmit and produce sound. Remember there is no net flow of air, just very small oscillations back and forth. Once the sound passes, the air molecule is left in the same position/location in the room.
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Follow Ups
- RE: if I may guess - MJ King 10:31:32 05/27/15 (6)
- OK, then this is possibly a really dumb observation....... - sober1 14:59:16 05/27/15 (5)
- RE: OK, then this is possibly a really dumb observation....... - Inmate51 05:28:15 05/29/15 (0)
- RE: OK, then this is possibly a really dumb observation....... - MJ King 16:02:49 05/27/15 (3)
- RE: OK, then this is possibly a really dumb observation....... - sober1 07:50:54 05/28/15 (1)
- RE: OK, then this is possibly a really dumb observation....... - MJ King 09:38:24 05/28/15 (0)
- RE: OK, then this is possibly a really dumb observation....... - MJ King 16:07:16 05/27/15 (0)