What is the SI unit of time? Write how it is related to the following units (a) 1 millisecond, (b) 1 hour and (c) 1 day.
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second. The second, symbol s, is the SI unit of time. It is defined by taking the fixed numerical value of the cesium frequency ΔνCs, 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.
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