How are units of length and time determined?
| October 29, 2020 | Education
The currently accepted time standard is based on the period of oscillations occurring in the atom of the cesium-133 isotope during its transition between two specific energy sublevels of the ground state. By definition, a unit of time – a second – contains 9 192 631 770 periods of such oscillations. To establish the basic unit of length, the same standard is currently used: by definition, a meter is the length of the path traveled by light in a vacuum in 1/299 792 458 seconds.
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