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The hertz is defined as one cycle per second.
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The units are sometimes also used as a representation of the energy of a photon, via the Planck relation E= hν, where E is the photon's energy, ν is its frequency, and the proportionality constant h is Planck's constant. It is also used to describe the clock speeds at which computers and other electronics are driven. 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. Hertz are commonly expressed in multiples: kilohertz ( 10 3 Hz, kHz), megahertz ( 10 6 Hz, MHz), gigahertz ( 10 9 Hz, GHz), terahertz ( 10 12 Hz, THz).
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It is named after Heinrich Rudolf Hertz (1857–1894), the first person to provide conclusive proof of the existence of electromagnetic waves. The hertz is an SI derived unit whose expression in terms of SI base units is s −1, meaning that one hertz is the reciprocal of one second. The hertz (symbol: Hz) is the unit of frequency in the International System of Units (SI) and is defined as one cycle per second. The time between each flash – the period T – is given by 1⁄ f (the reciprocal of f ) that is, 2, 1 and 0.5 seconds, respectively. Top to bottom: Lights flashing at frequencies f = 0.5 Hz, 1.0 Hz and 2.0 Hz that is, at 0.5, 1.0 and 2.0 flashes per second, respectively.