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A sinusoid with a frequency of 4 Hz
Hertz (or Hz for short) is unit of frequency, in cycles per second. One Hz is one cycle per second.

Common uses of Hertz include specifying sound pitch, processor clock speed (usually megahertz), and electromagnetic spectrum; such as the frequency of visible light (790–400 terahertz).

The frequency of the mains in a building, or power generated by a generator are also shown using hertz as the unit.

North America uses 60hz AC, whilst other parts of the globe use 50hz AC

SI multiples for Hertz (Hz)
Submultiples Multiples
Value Symbol Name Value Symbol Name
10−1 Hz dHz deciHertz 101 Hz daHz decaHertz
10−2 Hz cHz centiHertz 102 Hz hHz hectoHertz
10−3 Hz mHz milliHertz 103 Hz kHz kiloHertz
10−6 Hz µHz microHertz 106 Hz MHz megaHertz
10−9 Hz nHz nanoHertz 109 Hz GHz gigaHertz
10−12 Hz pHz picoHertz 1012 Hz THz teraHertz
10−15 Hz fHz femtoHertz 1015 Hz PHz petaHertz
10−18 Hz aHz attoHertz 1018 Hz EHz exaHertz
10−21 Hz zHz zeptoHertz 1021 Hz ZHz zettaHertz
10−24 Hz yHz yoctoHertz 1024 Hz YHz yottaHertz
Common prefixed units are in bold face.


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