Beats: strike (a person or an animal) repeatedly and violently so as to hurt or injure them, usually with an implement such as a club or whip.
forced vibration: Oscillation is the repetitive variation, typically in time, of some measure about a central value or between two or more different states. Familiar examples include a swinging pendulum.
infrasonic: relating to or denoting sound waves with a frequency below the lower limit of human audibility.
natural frequency: the frequency at which a system oscillates when not subjected to a continuous or repeated external force.
pitch: the quality of a sound governed by the rate of vibrations producing it; the degree of highness or lowness of a tone.
rarefaction: diminution in the density of something, especially air or a gas.
resonance: the reinforcement or prolongation of sound by reflection from a surface or by the synchronous vibration of a neighboring object.
ultrasonic: of or involving sound waves with a frequency above the upper limit of human hearing.
natural frequency: the frequency at which a system oscillates when not subjected to a continuous or repeated external force.
pitch: the quality of a sound governed by the rate of vibrations producing it; the degree of highness or lowness of a tone.
rarefaction: diminution in the density of something, especially air or a gas.
resonance: the reinforcement or prolongation of sound by reflection from a surface or by the synchronous vibration of a neighboring object.
ultrasonic: of or involving sound waves with a frequency above the upper limit of human hearing.