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It is claimed that two cesium clocks, if...

It is claimed that two cesium clocks, if allowed to run for 100 years, free from any disturbance, may differ by only about 0.02s. What does this imply for the accuracy of the standard cesium clock in measuring a time interval of 1s ?

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Accuracy of 1 part in `10^(11) "to" 10^(12)`
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