<Tr> <Th> Named after </Th> <Td> Heinrich Hertz </Td> </Tr> <Tr> <Th> In SI base units </Th> <Td> s </Td> </Tr> <P> The hertz (symbol: Hz) is the derived unit of frequency in the International System of Units (SI) and is defined as one cycle per second . It is named for Heinrich Rudolf Hertz, the first person to provide conclusive proof of the existence of electromagnetic waves . Hertz are commonly expressed in multiples: kilohertz (10 Hz, kHz), megahertz (10 Hz, MHz), gigahertz (10 Hz, GHz), terahertz (10 Hz, THz), petahertz (10 Hz, PHz), and exahertz (10 Hz, EHz). </P> <P> Some of the unit's most common uses are in the description of sine waves and musical tones, particularly those used in radio - and audio - related applications . It is also used to describe the speeds at which computers and other electronics are driven . </P>

1 kilohertz is equal to how many hertz