Sound 3
Sound 3 : (1) A mechanical disturbance transmitted from one point in a material medium to another, which can produce an auditory sensation. The advancing disturbance is called a sound wave; its speed of propagation, the speed of sound, is governed by the nature of the propagating medium. The complete description of any sound, from the physical viewpoint, requires specification of three quantities: the pitch (frequency); the loudness (sound intensity); and quality (timbre, waveform). As in all other forms of propagation, sound waves may suffer reflection, refraction, scattering, and diffraction. See also: sound absorption, threshold of audibility, decibel, ultrasonic, thunder, atmospheric acoustics. (2) From a psychophysical point of view, an auditory sensation resulting from the action of a sound wave upon the ear and its associated receptors
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