Terms for sound
Beats: When two sound waves of different frequency approach your ear, the alternating constructive and destructive interference causes the sound to be alternatively soft and loud
Compression: the reduction in volume (causing an increase in pressure) of the fuel mixture in an internal combustion engine before ignition.
Forced Vibration:This is an example of resonance - when one object vibrating at the same natural frequency of a second object forces that second object into vibrational motion. The result of resonance is always a large vibration. Regardless of the vibrating system, if resonance occurs, a large vibration results.
Infrasonic: relating to or denoting sound waves with a frequency below the lower limit of human audibility.
Natural Frequency: The frequency or frequencies at which an object tends to vibrate with when hit, struck, plucked, strummed or somehow disturbed is known as the natural frequency of the object.
Pitch: The sensation of a frequency is commonly referred to as the pitch of a sound. A high pitch sound corresponds to a high frequency sound wave and a low pitch sound corresponds to a low frequency sound wave.
Rarefaction: Compression and rarefaction. However instead of crests and troughs, longitudinal waves have compressions and rarefactions. A compression is a region in a longitudinal wave where the particles are closest together
Resonance: the reinforcement or prolongation of sound by reflection from a surface or by the synchronous vibration of a neighboring object.
Ultrasonic: 1. Of or relating to acoustic frequencies above the range audible to the human ear, or above approximately 20,000 hertz. 2. Of, relating to, or involving ultrasound.