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). Expert Network Time Protocol: An Experience in Time with NTP - Pàgina 15 per Peter Rybaczyk - 2006 - 153 pàgines Previsualització limitada -
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