Acoustics

The speed of an object in an interval of time is the distance traveled by the object divided by the duration of the interval; The measure of the rapidity of alterations of a periodic signal, expressed in cycles per second or Hz. The distance the sound wave travels to complete one cycle. The distance between one peak or crest of a sine wave and the next corresponding peak or crest. The wavelenth of any frequency may be found by dividing the speed of sound by the frequency. (speed of sound at sea level is 331.4 meters/second or 1087.42 feet/second).
 * Speed**
 * Frequency**
 * Wavelength **

Forward and/or backward, relative to some defined direction.
 * Longitudinal**

**Transverse** Situated or lying across; relative to some defined foward direction.