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'''Ultrasound''' is [[sound]] composed of frequencies in excess of 20,000 [[Hertz]] (20 kHz). Ultrasound falls outside the range of normal [[human]] hearing ability.
== Applications ==
Ultrasound has a variety of applications, including
* Non-destructive testing (NDT) and non-destructive evaluation (NDE) of materials
* Medical imaging and tissue characterization
* Range finding (sonar)
* Cleaning