One seond is defined as

1.	One seond is defined as
Answer» 1650763.73 PERODS of krypton clock 652189.6 peridos of krypton clock 1650763.73 periods of cesium clock 9192631770 periods of cesium clock. Solution :The second is the duration of 9192631770 periods of the radiation corresponding to the TRANSITION between the two hyperfine LEVELS of the GROUND state of the cesium-133 ATOM.

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