 | 1977 - 1412 pàgines
...1967 the atomic second was defined by the Thirteenth General Conference on Weights and Measures as the duration of 9,192,631,770 periods of the radiation corresponding to the transition between two hyperfine levels of the ground state of the cesium atom 133. This value was established to agree... | |
 | 1970 - 984 pàgines
[ El contingut d’aquesta pàgina està restringit ] | |
 | 1968 - 930 pàgines
[ El contingut d’aquesta pàgina està restringit ] | |
 | 1971 - 1140 pàgines
[ El contingut d’aquesta pàgina està restringit ] | |
 | 1984 - 782 pàgines
[ El contingut d’aquesta pàgina està restringit ] | |
 | 1974 - 64 pàgines
...International System of Units is the second defined as follows: "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-133 atom". 2 Resolution 1 adopted by the CIPM at its meeting of 1956 and Resolution 9 of the... | |
 | 1969 - 208 pàgines
...accurately than it could be done by astronomical means. So the second, since October 1967, is now defined as the duration of 9,192,631,770 periods of the radiation...transition between the two hyper-fine levels of the fundamental state of the atom cesium 133. Our Institute for Basic Standards is actively involved in... | |
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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). 
