The second has been defined to be
i.e. the time taken by the electron in cesium atom to transfer from one energy band to the other.....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.
Most of us don't know what exactly one second of time period refers to and how it is defined ...so here it is.
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