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An undesired sound, especially nonmusical sound that includes a random mix of frequencies.
A disturbance that transmits energy as it travels through matter or space.
A wave in which the motion of the particles of the medium is perpendicular to the path of the wave.
A wave, such as a sound wave, in which the particles of the medium move back and forth, parallel to the direction of motion of the wave.
The process by which a wave bounces back after striking a barrier that does not absorb all of the wave's energy.
The result of two or more waves overlapping.
Waves that form a pattern in which portions of the wave do not move and other portions move with increased amplitude.
Sound waves at frequencies below those which humans can hear.