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- Q5017052 subject Q6456862.
- Q5017052 subject Q8275100.
- Q5017052 subject Q8335275.
- Q5017052 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.".
- Q5017052 wikiPageWikiLink Q1108.
- Q5017052 wikiPageWikiLink Q11574.
- Q5017052 wikiPageWikiLink Q12457.
- Q5017052 wikiPageWikiLink Q1413102.
- Q5017052 wikiPageWikiLink Q1967606.
- Q5017052 wikiPageWikiLink Q2.
- Q5017052 wikiPageWikiLink Q227467.
- Q5017052 wikiPageWikiLink Q3537681.
- Q5017052 wikiPageWikiLink Q362396.
- Q5017052 wikiPageWikiLink Q39369.
- Q5017052 wikiPageWikiLink Q4480008.
- Q5017052 wikiPageWikiLink Q499637.
- Q5017052 wikiPageWikiLink Q525.
- Q5017052 wikiPageWikiLink Q6456862.
- Q5017052 wikiPageWikiLink Q711250.
- Q5017052 wikiPageWikiLink Q8275100.
- Q5017052 wikiPageWikiLink Q8335275.
- Q5017052 wikiPageWikiLink Q908676.
- Q5017052 wikiPageWikiLink Q911470.
- Q5017052 wikiPageWikiLink Q9121.
- Q5017052 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).".
- Q5017052 label "Caesium standard".