Assertion: frequency | /r/HasProperty | expressed in the hertz unit
Facets:
value: usually
type: TEMPORAL
Source sentences:
text: Usually frequency is expressed in the hertz unit, named in honour of the 19th-century German physicist Heinrich Rudolf Hertz, one hertz being equal to one cycle per second, abbreviated Hz; one kilohertz (kHz) is 1,000 Hz, and one megahertz (MHz) is 1,000,000 Hz.