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Assuming that you means a second, rather than a sencond, the modern definition is that it is the time it takes for 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom.

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9y ago

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1/60th of a minute

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9y ago
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Q: What is 1 second equal to?
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