 | Peter Burberry - 1975 - 356 pągines
[ El contingut d’aquesta pągina estą restringit ] | |
 | J. S. Zaveri - 1975 - 172 pągines
[ El contingut d’aquesta pągina estą restringit ] | |
 | Francis F. Huang - 1976 - 535 pągines
[ El contingut d’aquesta pągina estą restringit ] | |
 | Lynn L. Faulkner - 1976 - 600 pągines
[ El contingut d’aquesta pągina estą restringit ] | |
 | 1976 - 954 pągines
...terms of a resonance of the cesium atom. The present definition of the second states, "The second is the duration of 9,192,631,770 periods of the radiation...the two hyperfine levels of the ground state of the cesium-133 atom." [13th CGPM (1967), Resolution 1] A very important change occurred when, in 1967,... | |
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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). 
