Sup, iam Phyllis Ko, Today’s going to be an amazing day for you. I can feel it!
Why Is 1 Second A Second? [Solved]
Definition. The second is defined by taking the fixed numerical value of the caesium frequency ∆ν, the unperturbed ground-state hyperfine transition frequency of the caesium 133 atom, to be 9 192 631 770 when expressed in the unit Hz, which is equal to s−1. The wording of the definition was updated in 2019.
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