Sound Waves and Decibels
THE AUDIO AND ELECTROMAGNETIC SPECTRA
Sound is wave motion in an elastic medium, a train of compression and decompression waves that travel in air at 1100 feet or 335 meters per second, at sea level, on a fine day.
As with all wave motion, no matter actually travels, just the effect, as one portion of the medium affects the next, which affects the next and so on. A speaker diaphragm makes sound waves by moving forwards and back at the audio rate. Several different sounds can be reproduced at the same time by a single diaphragm because many frequencies mixed together add and subtract at every instant to form a single complex wave.
This statement can be tested if you draw a graph of high and low frequency sine ...
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