- sound consists of the perception of waves emanating from moving objects. An object moves rapidly or slowly, and sets into vibration the air in its vicinity which pulses. When these pulses strike the eardrum they set into motion the individual's sound recording mechanism and the sound is registered. Sound is absent in a vacuum and is actually merely a force wave. (SA, p. 84)
- sound is a by-product of communication. It is the carrier wave of communication and is not itself communication. (Dn 55.l, p. 131)
- sound has several parts. The first is pitch. This is the number of vibrations per unit of time of any object from which sound is coming. The second is quality or tone which is simply the difference between a jagged or ragged sound wave and a smooth sound wave as in a musical note. The third is volume, which merely means the force of the sound wave, its loudness or quietness. (SA, p. 85)