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Hertz
The HERTZ (symbol: Hz) is the derived unit of frequency in the International System of Units
International System of Units
(SI) and is defined as one cycle per second . It is named for Heinrich Rudolf Hertz
Hertz
, the first person to provide conclusive proof of the existence of electromagnetic waves . Hertz
Hertz
are commonly expressed in multiples : kilohertz (103 Hz, kHz), megahertz (106 Hz, MHz), gigahertz (109 Hz, GHz), and terahertz (1012 Hz, THz). 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. It is also used to describe the speeds at which computers and other electronics are driven
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Hertz (other)
The HERTZ (Hz) is the SI unit of frequency. HERTZ may also refer to: * Heinrich Hertz
Hertz
, (1857–1894), a German physicist * Hertz
Hertz
(surname) * Hertz
Hertz
(crater) , on Moon * Franck– Hertz
Hertz
experiment , fundamental physics * The Hertz
Hertz
Corporation , a car and equipment rental serviceSEE ALSO * Everybody Hertz
Hertz
, an album by Air * Herz (other) * Herts, an abbreviation of Hertfordshire * 52-hertz whale This disambiguation page lists articles associated with the title HERTZ. If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from "https://en.wikipedia.org/w/index.php?title=Hertz_(other) additional terms may apply
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Hz (other)
HZ is the International Standard symbol for Hertz
Hertz
, a unit of frequency
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Megahertz (other)
MEGAHERTZ may refer to: * 1,000,000 Hertz
Hertz
(the SI unit of frequency) * Megahertz (horse) , a Thoroughbred racehorse * Megahertz (record producer) , American record producer, composer and songwriter This disambiguation page lists articles associated with the title MEGAHERTZ. If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from "https://en.wikipedia.org/w/index.php?title=Megahertz_(other) additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy .® is a registered trademark of the Wikimedia Foundation, Inc
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System Of Measurement
A SYSTEM OF MEASUREMENT is a collection of units of measurement and rules relating them to each other. Systems of measurement have historically been important, regulated and defined for the purposes of science and commerce . Systems of measurement in modern use include the metric system , the imperial system , and United States
United States
customary units
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SI Derived Unit
The International System of Units (SI) specifies a set of seven base units from which all other SI units of measurement are derived. These SI DERIVED UNITS are either dimensionless , or can be expressed as a product of one or more of the base units, possibly scaled by an appropriate power of exponentiation . Many derived units do not have special names. For example, the SI derived unit of area is the square metre (m2) and the SI derived unit of density is the kilogram per cubic metre (kg/m3 or kg m−3). However, 22 derived units are recognized by the SI with special names, which are written in lowercase. However, the symbols for units named after persons, are always written with an uppercase initial letter. For example, the symbol for the hertz is "Hz"; but the symbol for the metre is "m"
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Frequency
FREQUENCY is the number of occurrences of a repeating event per unit time . It is also referred to as TEMPORAL FREQUENCY, which emphasizes the contrast to spatial frequency and angular frequency . The PERIOD is the duration of time of one cycle in a repeating event, so the period is the reciprocal of the frequency. For example, if a newborn baby's heart beats at a frequency of 120 times a minute, its period—the time interval between beats—is half a second (that is, 60 seconds divided by 120 beats ). Frequency is an important parameter used in science and engineering to specify the rate of oscillatory and vibratory phenomena, such as mechanical vibrations, audio (sound ) signals, radio waves , and light
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Heinrich Hertz
HEINRICH RUDOLF HERTZ (German: ; 22 February 1857 – 1 January 1894) was a German physicist who first conclusively proved the existence of the electromagnetic waves theorized by James Clerk Maxwell 's electromagnetic theory of light . The unit of frequency — cycle per second — was named the "hertz " in his honor. CONTENTS* 1 Biography * 1.1 Death * 2 Scientific work * 2.1 Meteorology * 2.2 Contact mechanics * 2.3 Electromagnetic waves * 2.4 Cathode rays * 3 Nazi
Nazi
persecution * 4 Legacy and honors * 5 See also * 6 References * 7 Further reading * 8 External links BIOGRAPHYHeinrich Rudolf Hertz
Hertz
was born in 1857 in Hamburg
Hamburg
, then a sovereign state of the German Confederation , into a prosperous and cultured Hanseatic family
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SI Base Unit
The International System of Units
International System of Units
(SI) defines seven units of measure as a basic set from which all other SI units can be derived . The SI BASE UNITS and their physical quantities are the metre for measurement of length , the kilogram for mass , the second for time , the ampere for electric current , the kelvin for temperature , the candela for luminous intensity , and the mole for amount of substance . The SI base units form a set of mutually independent dimensions as required by dimensional analysis commonly employed in science and technology. The names and symbols of SI base units are written in lowercase, except the symbols of those named after a person, which are written with an initial capital letter
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Second
The SECOND (symbol: S) (abbreviated S or SEC) is the base unit of time in the International System of Units
International System of Units
/ Système International d'Unités (SI). It is qualitatively defined as the second division of the hour by sixty, the first division by sixty being the minute . The SI definition of second is "the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom". Seconds may be measured using a mechanical, electrical or an atomic clock . SI prefixes are combined with the word second to denote subdivisions of the second, e.g., the millisecond (one thousandth of a second), the microsecond (one millionth of a second), and the nanosecond (one billionth of a second). Though SI prefixes may also be used to form multiples of the second such as kilosecond (one thousand seconds), such units are rarely used in practice
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Multiplicative Inverse
In mathematics , a MULTIPLICATIVE INVERSE or RECIPROCAL for a number x, denoted by 1/x or x−1, is a number which when multiplied by x yields the multiplicative identity , 1. The multiplicative inverse of a fraction a/b is b/a. For the multiplicative inverse of a real number, divide 1 by the number. For example, the reciprocal of 5 is one fifth (1/5 or 0.2), and the reciprocal of 0.25 is 1 divided by 0.25, or 4. The RECIPROCAL FUNCTION, the function f(x) that maps x to 1/x, is one of the simplest examples of a function which is its own inverse (an involution ). The term reciprocal was in common use at least as far back as the third edition of Encyclopædia Britannica (1797) to describe two numbers whose product is 1; geometrical quantities in inverse proportion are described as reciprocall in a 1570 translation of Euclid
Euclid
's Elements
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International System Of Units
The INTERNATIONAL SYSTEM OF UNITS (abbreviated as SI, from the French _Système internationale (d'unités)_) is the modern form of the metric system , and is the most widely used system of measurement . It comprises a coherent system of units of measurement built on seven base units . The system also establishes a set of twenty prefixes to the unit names and unit symbols that may be used when specifying multiples and fractions of the units. The system was published in 1960 as a result of an initiative that began in 1948. It is based on the metre–kilogram–second system of units (MKS) rather than any variant of the centimetre–gram–second system (CGS). SI is intended to be an evolving system, so prefixes and units are created and unit definitions are modified through international agreement as the technology of measurement progresses and the precision of measurements improves
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Cycle Per Second
The CYCLE PER SECOND was a once-common English name for the unit of frequency now known as the hertz . The plural form was typically used, often written CYCLES PER SECOND, CYCLES/SECOND, C.P.S., C/S, ~, or, ambiguously, just CYCLES. The term comes from the fact that sound waves have a frequency measurable in their number of vibrations, or cycles, per second. With the organization of the International System of Units in 1960, the cycle per second was officially replaced by the hertz , or reciprocal second . Symbolically, "cycle per second" units are "cycle/second", while hertz is "1/s" or "s−1". This particular mandate has been so widely adopted as to render the old 'cycle per second' all but extinct. For higher frequencies, kilocycles (kc), as an abbreviation of kilocycles per second were often used on components or devices. Other higher units like megacycle (Mc) and less commonly kilomegacycle (kMc) were used before 1960 and in some later documents
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Electromagnetic Wave
In physics , ELECTROMAGNETIC RADIATION (EM RADIATION or EMR) refers to the waves (or their quanta, photons ) of the electromagnetic field , propagating (radiating) through space carrying electromagnetic radiant energy . It includes radio waves , microwaves , infrared , (visible) light , ultraviolet , X- , and gamma radiation. Classically , electromagnetic radiation consists of ELECTROMAGNETIC WAVES, which are synchronized oscillations of electric and magnetic fields that propagate at the speed of light through a vacuum . The oscillations of the two fields are perpendicular to each other and perpendicular to the direction of energy and wave propagation, forming a transverse wave . The wavefront of electromagn