2. Defining A Second
What exactly do we mean when we think of ‘one second’? If you thought that it is simply 1/60th of one full minute, then you’re not really defining it objectively.
In reality, the duration of one second is the time duration of a total of 9.192,631,770 periods of radiation that correspond to the transition in between the two hyperfine levels of the ground state of the cesium 133 atoms. That’s how the scientists describe it!
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