
1) Bimonthly journal 2) It deals with waves
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vibrations of frequencies greater than the upper limit of the audible range for humansthat is, greater than about 20 kilohertz. The term sonic is ... [5 related articles]
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http://www.britannica.com/eb/a-z/u/5

The science of sound waves with frequencies above those that humans can hear (>20 kHz). With modern piezoelectric techniques, ultrasonic waves having frequencies above 24 kHz can be readily generated with high efficiency and intensity in solids and liquids, and exhibit the normal wave properties of ...
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http://www.daviddarling.info/encyclopedia/U/ultrasonics.html

That part of the science of acoustics dealing with the frequency range beyond the upper limit of perception by the human ear (beyond 20,000 hertz per second), but usually restricted to frequencies above 500,000 hertz per second. Ultrasonic radiation is injurious to tissues because of its thermal effects when absorbed by living matter, but in contro...
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http://www.encyclo.co.uk/local/20973

(ul″trә-son´iks) that part of the science of acoustics dealing with the frequency range beyond the upper limit of perception by the human ear (20,000 hertz), but usually restricted to frequencies above 50,000 hertz. Ultrasonic radiation is harmful to tissues because it heats up matter that absorbs it; ...
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http://www.encyclo.co.uk/local/21001

Type: Term Pronunciation: ŭl′tră-son′iks Definitions: 1. The science and technology of ultrasound, its characteristics and phenomena.
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http://www.medilexicon.com/medicaldictionary.php?t=95512

It is the study and application of the sound and vibration produced by ultrasonic pressure waves.
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http://www.vidyagyaan.com/general-knowledge/science/glossary-of-physics-ter

Branch of physics dealing with the theory and application of ultrasound: sound waves occurring at frequencies too high to be heard by the human ear (that is, above about 20 kHz). The earliest practical application of ultrasonics was the detection of submarines during World War I by reflecting pulses of sound from them (see sonar). Similar princ...
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https://www.encyclo.co.uk/local/21221

the branch of science that deals with the effects of sound waves above human perception.
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https://www.infoplease.com/dictionary/ultrasonics
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