April 2013
Beginner
224 pages
7h 22m
English
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The nature of sound
What is sound?
When there is a variation of air pressure at frequencies between approximately 16 to 16,000 Hz, the human ear (depending on age and health), can detect sound. The change in air pressure can be caused by a variety of sources such as the human voice, musical instruments, etc. Some of the terms used to describe the characteristics of the sounds are:
Sound waves are produced by increased air pressure and rarefaction along the line of travel.
Frequency of sound is the number of regular excursions made by an air particle in 1 s (see figure below).
Wavelength of a pure tone (i.e. a sine wave is the distance between successive peaks).
The time taken for a complete cycle of pure tone (A) to begin to repeat itself (B) ...
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