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. Second refers to the SI base unit of time​

Sagot :

Answer:

Second – Unit of Time :-)

Explanation:

The second is defined by taking the fixed numerical value of the cesium frequency ∆νCs, the unperturbed ground-state hyperfine transition frequency of the cesium-133 atom, to be 9,192,631,770 when expressed in the unit Hz, which is equal to s−1.