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- Caesium_standard abstract "A caesium standard or caesium atomic clock is a primary frequency standard in which electronic transitions between the two hyperfine ground states of caesium-133 atoms are used to control the output frequency. The first caesium clock was built by Louis Essen in 1955 at the National Physical Laboratory in the UK.Caesium clocks are the most accurate commercially produced time and frequency standards, and serve as the primary standard for the definition of the second in SI (the metric system). By definition, radiation produced by the transition between the two hyperfine ground states of caesium (in the absence of external influences such as the Earth's magnetic field) has a frequency of exactly 9,192,631,770 Hz. That value was chosen so that the caesium second equalled, to the limit of human measuring ability in 1960 when it was adopted, the existing standard ephemeris second based on the Earth's orbit around the Sun. Because no other measurement involving time had been as precise, the effect of the change was less than the experimental uncertainty of all existing measurements.".
- Caesium_standard wikiPageID "40858".
- Caesium_standard wikiPageLength "2153".
- Caesium_standard wikiPageOutDegree "20".
- Caesium_standard wikiPageRevisionID "679901682".
- Caesium_standard wikiPageWikiLink Atom.
- Caesium_standard wikiPageWikiLink Atomic_clock.
- Caesium_standard wikiPageWikiLink Caesium.
- Caesium_standard wikiPageWikiLink Category:Atomic_clocks.
- Caesium_standard wikiPageWikiLink Category:Caesium.
- Caesium_standard wikiPageWikiLink Category:Electronics_standards.
- Caesium_standard wikiPageWikiLink Earth.
- Caesium_standard wikiPageWikiLink Ephemeris_time.
- Caesium_standard wikiPageWikiLink Frequency_standard.
- Caesium_standard wikiPageWikiLink Ground_state.
- Caesium_standard wikiPageWikiLink Hertz.
- Caesium_standard wikiPageWikiLink Hyperfine_structure.
- Caesium_standard wikiPageWikiLink International_System_of_Units.
- Caesium_standard wikiPageWikiLink Louis_Essen.
- Caesium_standard wikiPageWikiLink Molecular_electronic_transition.
- Caesium_standard wikiPageWikiLink National_Physical_Laboratory_(United_Kingdom).
- Caesium_standard wikiPageWikiLink Primary_standard.
- Caesium_standard wikiPageWikiLink Rubidium_standard.
- Caesium_standard wikiPageWikiLink Second.
- Caesium_standard wikiPageWikiLink Sun.
- Caesium_standard wikiPageWikiLinkText "Caesium Beam".
- Caesium_standard wikiPageWikiLinkText "Caesium atomic frequency standard".
- Caesium_standard wikiPageWikiLinkText "Caesium standard".
- Caesium_standard wikiPageWikiLinkText "Cs".
- Caesium_standard wikiPageWikiLinkText "caesium clock".
- Caesium_standard wikiPageWikiLinkText "caesium standard".
- Caesium_standard wikiPageWikiLinkText "cesium atomic standards".
- Caesium_standard wikiPageWikiLinkText "cesium clocks".
- Caesium_standard wikiPageWikiLinkText "cesium frequency standard".
- Caesium_standard wikiPageUsesTemplate Template:Commons_category.
- Caesium_standard wikiPageUsesTemplate Template:FS1037C_MS188.
- Caesium_standard wikiPageUsesTemplate Template:Physics-stub.
- Caesium_standard subject Category:Atomic_clocks.
- Caesium_standard subject Category:Caesium.
- Caesium_standard subject Category:Electronics_standards.
- Caesium_standard hypernym Frequency.
- Caesium_standard type TelevisionStation.
- Caesium_standard type Element.
- Caesium_standard type Physic.
- Caesium_standard type Quantity.
- Caesium_standard type Source.
- Caesium_standard comment "A caesium standard or caesium atomic clock is a primary frequency standard in which electronic transitions between the two hyperfine ground states of caesium-133 atoms are used to control the output frequency. The first caesium clock was built by Louis Essen in 1955 at the National Physical Laboratory in the UK.Caesium clocks are the most accurate commercially produced time and frequency standards, and serve as the primary standard for the definition of the second in SI (the metric system).".
- Caesium_standard label "Caesium standard".
- Caesium_standard sameAs Q5017052.
- Caesium_standard sameAs Category:Caesium_clocks.
- Caesium_standard sameAs m.0b5yd.
- Caesium_standard sameAs Q5017052.
- Caesium_standard wasDerivedFrom Caesium_standard?oldid=679901682.
- Caesium_standard isPrimaryTopicOf Caesium_standard.