The hertz (symbol Hz) is the SI unit of frequency defined as the number of cycles per second of a periodic phenomenon. One of its most common uses is the description of the sine wave, particularly those used in radio and audio applications.
In English, hertz is used as a plural. As an SI unit, Hz can be prefixed; commonly used multiples are kHz (kilohertz, 103 Hz), MHz (megahertz, 106 Hz), GHz (gigahertz, 109 Hz) and THz (terahertz, 1012 Hz). One hertz simply means "one cycle per second" (typically that which is being counted is a complete cycle); 100 Hz means "one hundred cycles 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. The "frequency" (activity) of aperiodic or stochastic events, such as radioactive decay, is expressed in becquerels.
Coordinates | 32°31′44″N115°43′23″N |
---|---|
Name | Hertz |
Standard | SI derived unit |
Quantity | Frequency |
Symbol | Hz |
Namedafter | Heinrich Hertz |
Extralabel | In SI base units: |
Extradata | 1 Hz = 1/s |
The term "gigahertz", most commonly used in computer processor clock rates and radio frequency (RF) applications, can be pronounced either , with a hard sound, or , with a soft (see giga-#Pronunciation). The prefix "giga-" is derived directly from the Greek "."
Radio frequency radiation is usually measured in kilohertz, megahertz, or gigahertz; this is why radio dials are commonly labeled with kHz, MHz, and GHz. Light is electromagnetic radiation that is even higher in frequency, and has frequencies in the range of tens (infrared) to thousands (ultraviolet) of terahertz. Electromagnetic radiation with frequencies in the low terahertz range, (intermediate between those of the highest normally usable radio frequencies and long-wave infrared light), is often called terahertz radiation. Even higher frequencies exist, such as that of gamma rays, which can be measured in exahertz. (For historical reasons, the frequencies of light and higher frequency electromagnetic radiation are more commonly specified in terms of their wavelengths or photon energies: for a more detailed treatment of this and the above frequency ranges, see electromagnetic spectrum.)
Various computer buses, such as the front-side bus connecting the CPU and northbridge, also operate at different frequencies in the megahertz range (for modern products).
CRT television and monitor refresh rates are measured in hertz.
Category:SI derived units Category:Units of frequency
ar:هرتز ast:Herciu zh-min-nan:Hz be:Герц, адзінка вымярэння be-x-old:Гэрц (адзінка вымярэньня) bo:ཧེར་ཚི། bs:Herc br:Hertz bg:Херц ca:Hertz cs:Hertz cy:Hertz da:Hertz de:Hertz (Einheit) et:Herts el:Χερτζ es:Hercio eo:Herco eu:Hertz fa:هرتز fr:Hertz fy:Hertz (ienheid) ga:Heirts gl:Hertz hak:Het-tsṳ̂ ko:헤르츠 hi:हर्ट्ज़ hr:Herc id:Hertz ia:Hertz it:Hertz he:הרץ jv:Hertz lv:Hercs lb:Hertz lt:Hercas hu:Hertz mk:Херц ml:ഹെർട്സ് mr:हर्ट्झ ms:Hertz nl:Hertz (eenheid) ja:ヘルツ no:Hertz nn:Hertz mhr:Герц (шотлымаш) pnb:ہرٹز pl:Herc pt:Hertz ro:Hertz ru:Герц (единица измерения) sq:Herci simple:Hertz sk:Hertz (jednotka) sl:Herc sr:Херц sh:Herc fi:Hertsi sv:Hertz ta:ஏர்ட்சு tt:Герц (үлчәү берәмлеге) th:เฮิรตซ์ tg:Ҳертс tr:Hertz (birim) uk:Герц ur:ہرٹز vi:Hertz zh-yue:赫茲 zh:赫兹This text is licensed under the Creative Commons CC-BY-SA License. This text was originally published on Wikipedia and was developed by the Wikipedia community.
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