 | David A. Chasis - 1976 - 232 páginas
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 | Simo Heikki Laurila - 1976 - 568 páginas
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 | Charles Edward Smith - 1976 - 240 páginas
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 | United States. Office of Naval Research - 1976 - 592 páginas
...System of Units should be the second defined as follows: "The second is the duration of 9 192 631 770 periods of the radiation corresponding to the transition...hyperfine levels of the ground state of the cesium atom 133," a definition that is still retained. MICROWAVE ABSORPTION SPECTROSCOPY Microwave absorption... | |
 | 1976 - 664 páginas
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 | Christopher R. Kitchin - 2003 - 276 páginas
...current unit of time is the second, which has been defined since 1967 as "the duration of 9192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the fundamental state of the atom caesium 133". The average results from a large number of atomic clocks... | |
 | Andre Heck - 2003 - 312 páginas
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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). 
