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Applications of Ultrasound and Infrasound

The applications and physics of ultrasonic and infrasonic sounds. For my physics 20 Sound Unit project.

Brett Goller

on 12 April 2011

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Transcript of Applications of Ultrasound and Infrasound

Applications of Ultrasound and Infrasound Ultrasound Infrasound In scientific terms, ultrasound is a sound pressure, cyclic in nature, that has a greater frequency than the limit at the top of human hearing capabilities. In healthy young adults, this upper hearing capability is an average of 20 kilohertz (kHz) What this means is that an ultrasonic sound can't be heard by the human ear because their frequency is too high for our ears to pick up. Ultrasound has many applications in several fields. Perhaps the best known application for ultrasound is sonography. This is where medical staff use the high pitched noise to produce a picture of a fetus while in the mother's womb. Another use however, doesn't directly concern humans at all. Bats use the high pitched noises to see in the dark and get an accurate reading on their prey's internal structure. A popular belief is that an ultrasonic sound has the ability to turn the locking mechanism in a door lock, as demonstrated on some spy movies. On the opposite side of this are infrasonic sounds. These are noises with a frequency less than the lowest level of human hearing capabilities The lower level of human hearing capability is exactly 20 Hertz (Hz) It is possible for humans to percieve infrasonic sounds, but only if the air pressure is sufficient.
Although the ear is the main tool for hearing these low sounds, it is possible for other parts of the body to "feel them". Infrasound can be used to send signals in the army to special machines that can pick them up. these can be used to transmit vital data. Animals are able to pick up some low infrasonic noises which warn them of natural disasters before they happen, generally earthquakes and tsunamis. THE END
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