Eventually, this definition too was found to be inadequate for precise time measurements, so in 1967, the SI second was again redefined as 9,192,631,770 periods of the radiation emitted by a caesium-133 atom in the transition between the two hyperfine levels of its ground state.
Eventually, this definition too was found to be inadequate for precise time measurements, so in 1967, the SI second was again redefined as 9,192,631,770 periods of the radiation emitted by a caesium-133 atom in the transition between the two hyperfine levels of its ground state.
user
Згодом і це визначення виявилося невідповідним для точного вимірювання часу, тому в 1967 році секунда СІ була ще раз перевизначена як 9 192 631 770 періодів випромінювання атома цезію-133 при переході між двома надтонкими рівнями основного стану.
assistant