Ultrasound

Range of audibility for human is from 20 Hz to 20 kHz.

Ultrasound are sound waves with frequencies above the upper limit of the human range of audibility (above 20 kHz).
Infrasound are sound waves with frequencies below the lower limit of the human range of audibility (below 20 Hz).

Application
  • Ultrasound is used to check for cracks or cavities for quality control.
  • Ultrasound is used to form images of babies in the womb.
  • Ultrasound is used to break the kidney stone.
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