About: http://webisa.webdatacommons.org/315922998

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Ultrasonic frequencies are generally at least about 20 kHz and more particularly are in the range of approximately 40 kHz to 200 kHz.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com