Seconds, Time and Atomic Clocks
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Seconds, Time and Atomic Clocks
We start by defining the units of time, which we know as seconds. In order to define a second with great accuracy, we need a source that we can time with high accuracy and reproducibility. The unit of second was defined using the Cesium-133 atom, which has 55 protons and 78 neutrons. Atoms in general have electrons that occupy distinct energy ...
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