Ultrasounds are high-frequency waves, beyond the range of human hearing, used extensively in industries and medical settings for various purposes.
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Ultrasounds are mechanical waves that propagate through a medium by vibrating particles in the form of compressions and rarefactions. Specifically, they are a type of longitudinal wave, where the oscillations occur parallel to the direction of wave propagation. Ultrasounds have frequencies above the human audible range, typically exceeding 20,000 hertz.