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Ultrasound is cyclic sound pressure with a frequency of 20 kilohertz or over, greater than the upper limit of human hearing.
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Acousto-optics is a branch of physics that studies the interactions between sound waves and light waves, especially the diffraction of laser light by ultrasound or sound in general.
Sonochemistry is the study of the effect of sonic waves and wave properties on chemical systems.
Therapeutic ultrasound is a rapidly growing field, with a wide range of novel therapies being developed. Some areas of current interest in the field of therapeutic ultrasound include: tumor ablation, stroke, vascular malfunction, and targeted gene and drug delivery. Numerous companies, the world over, have been formed that are dedicated to developing technologies for various ultrasound-based therapies.
Sites listed here will focus on the scientific and technical aspects of therapeutic ultrasound.

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An ultrasonic motor is a type of electric motor formed from the ultrasonic vibration of a component, the stator, placed against another, the rotor or slider.