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One seond is defined asA. 1650763.73 perods of krypton clockB. 652189.6 peridos of krypton clockC. 1650763.73 periods of cesium clockD. 9192631770 periods of cesium clock.

Answer» Correct Answer - D
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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