1.

What is the meaning of this? 1 second is the time interval of 9192631770 vibrations of radiation corresponding to the transition between two hyperfine levels of the ground state of caesium 133 atom

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What is the meaning of this?

1 second is the time interval of 9192631770 vibrations of radiation corresponding to the transition between two hyperfine levels of the ground state of caesium 133 atom



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