 | John J. Keller - 1975 - 96 pàgines
[ El contingut d’aquesta pàgina està restringit ] | |
 | R. H. Stoy - 1974 - 552 pàgines
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 | Byron Emerson Blair - 1974 - 482 pàgines
...XIII General Conference on Weights and Measures in 1967: "The second is the duration of 9 192 631 770 periods of the radiation corresponding to the transition...the two hyperfine levels of the ground state of the cesium133 atom" (see chap. 1). The realization of an output frequency from a real device involves several... | |
 | Gordon M. Bragg - 1974 - 208 pàgines
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 | R. G. Liptai, Jack W. Pearson - 1975 - 350 pàgines
...(adopted at 1st and 3rd CGPM 1889 and 1901) A2.12.3 second — The second is the duration of 9 192 631 770 periods of the radiation corresponding to the transition...the two hyperfine levels of the ground state of the cesium-I33 atom." (adopted at I3th CGPM 1967) A2. 12.4 ampere — The dmpere is that constant current... | |
 | Robert A. Hopkins - 1975 - 308 pàgines
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The 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 cesium- 133 atom (13th CGPM, 1967). 
