Assertion: ultrasound | /r/HasProperty | sound
Facets:
value: above 20khz
type: OTHER
value: at very high frequencies
type: OTHER
Source sentences:
text: Ultrasound is sound that travels through soft tissue and fluids, but it bounces back, or echoes, off denser surfaces.
text: Ultrasound is sound at very high frequencies, above those most people can hear – usually above 20kHz.
text: Ultrasounds are the vibrations and sounds used to create a medical image.