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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Solution
It is the standard definition of one second
Second is the SI unit of time.
According to its definition, one second is that time in which the radiation corresponds to the transition between two hyperfine levels of the ground state of the element Caesium-133 that vibrates 9192631770 times.