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A period of time?

Answer:
The second is the international unit of time, equal to 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 caesium 133 atom.
First answer by ID2050586803. Last edit by Pasha582. Contributor trust: 191 [recommend contributor recommended]. Question popularity: 2 [recommend question].

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