Information AboutKhz |
| CATEGORIES ABOUT HERTZ | |
| si derived units | |
| units of frequency | |
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The hertz (symbol: Hz) is the SI unit of Frequency . In English, ''hertz'' is used as both singular and plural. DEFINITION One hertz is defined as the reciprocal Second . :1 Hz = 1 s−1 SI MULTIPLES EXPLANATION One hertz simply means "one per Second " (1 / s); 100 Hz means "one hundred per second", and so on. The unit may be applied to any periodic event – for example, a clock might be said to tick at 1 Hz, or a human heart might be said to Beat at 1.2 Hz. Frequency of aperiodic events, such as radioactive decays, is expressed in Becquerel s. To avoid confusion, periodically varying angles are typically ''not'' expressed in hertz, but rather in an appropriate angular unit such as radians per second. A disc rotating at 1 revolution per minute (RPM) can thus be said to be rotating at 0.105 rad/s ''or'' 0.017 Hz, where the latter reflects the number of ''complete'' revolutions per second. HISTORY The hertz is named after the (''Conférence générale des poids et mesures'') in 1960, replacing the previous name for the unit, ''cycles per second'' (cps), along with its related multiples, primarily ''kilocycles'' (kc) and ''megacycles'' (Mc). Hertz largely replaced cycles in common use by 1970. SEE ALSO |
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