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Hertz

The SI unit of frequency indicating the number of cycles per second (symbol Hz). The name is in honour of Heinrich Hertz, an early German investigator of radio wave transmission.

Examples
infrasound	<20 Hz
lower audible limit	20 Hz
middle C	264 Hz
treble A	440 Hz
upper audible limit	20000 Hz
VHF radio	30 to 300 MHz
UHF radio	300 to 3000 MHz
Red end of visible spectrum	4.284x10¹⁴Hz
Violet end of visible spectrum	7.495x10¹⁴Hz

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