Difference between revisions of "Ultrasonic"
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Ultrasonic ( or Ultrasound) is sound with a frequency greater than the upper limit of human hearing (greater than 20 kHz). (Wikipedia) | |||
[[Category:Ultrasonic]] | [[Category:Ultrasonic]] | ||
Revision as of 14:21, 24 June 2011
Ultrasonic ( or Ultrasound) is sound with a frequency greater than the upper limit of human hearing (greater than 20 kHz). (Wikipedia)
