The official definition of one second is based on how many cycles of the cesium-133 atom?

Answer

Exactly 9,192,631,770 cycles

The ultimate refinement in timekeeping involved utilizing the fundamental stability found in atomic resonance, leading to the atomic standard. The definition of the second was officially anchored to the physical properties of the cesium-133 atom in 1967. Specifically, one second is precisely defined by the frequency of radiation emitted or absorbed when the atom transitions between two specified energy levels. This precise measurement requires counting exactly 9,192,631,770 cycles of this radiation. This extremely high, defined number ensures unparalleled stability, allowing modern atomic clocks to maintain accuracy over millions of years, vastly exceeding the precision of mechanical regulators.

The official definition of one second is based on how many cycles of the cesium-133 atom?

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