Ultrasound
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Ultrasound is an oscillating sound pressure wave with a frequency greater than the upper limit of the human hearing range. Ultrasound is thus not separated from 'normal' (audible) sound based on differences in physical properties, only the fact that humans cannot hear it. Although this limit varies from person to person, it is approximately 20 kilohertz (20,000 hertz) in healthy, young adults. Ultrasound devices operate with frequencies from 20 kHz up to several gigahertz.
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See also
- Acoustic droplet ejection
- Acoustic emission
- Bat detector
- Delay line memory
- Infrasound — sound at extremely low frequencies
- Isochoic
- Laser ultrasonics
- Phased array ultrasonics
- Picosecond Ultrasonics
- Sonomicrometry
- Sound from ultrasound (also known as Hypersonic sound)
- Surface acoustic wave
- Ultrasonic motor
- Ultrasound attenuation#Ultrasound
- Ultrasound attenuation spectroscopy
- Zone sonography technology
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