one second is defined to be equal to_periods of cesium clock.
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Today, one second is defined as “9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom”. That's a mouthful. ... When scientists moved to their new “atomic clock” in 1967, they calibrated it with his measurements.
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9,192,631,770 periods
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