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A230458
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Decimal expansion of Δν_{Cs} in unit s^{-1}; one of the seven units of the 2019 SI system.
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13
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OFFSET
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10,1
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COMMENTS
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The second s is defined to be exactly 9192631770 periods of the resonance frequency of the hyperfine transition of the cesium 133 atom.
Prime factors of this number are 2^1, 3^2, 5^1, 7^2, 47^1, 44351^1. - John W. Nicholson, Jun 15 2014
The value was fixed in 1968 by the 13th CGPM in terms of periods of the radiation due to the transition between the two hyperfine levels of the ground state of 133Cs atoms. - Stanislav Sykora, Mar 30 2015
In the 2019 SI system of units (see the BIPM link, and A322415) one of the seven units is Δν_{Cs} = Δν(^{133}Cs)_{hfs} = 9192631770 s^{-1}. - Wolfdieter Lang, Feb 12 2019
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LINKS
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FORMULA
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Δν_{Cs} = 9192631770 s^{-1}.
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EXAMPLE
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c = 9192631770 m/s.
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MATHEMATICA
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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