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How is "one second time" defined in SI system?​
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How is "one second time" defined in SI system?​

User Laurence MacNeill
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Answer:

Since 1997: A second is a time equal to 9,192,631,770 periods of radiation corresponding to the transition between two hyperfine levels of the ground state of the cesium-133 atom.

This definition refers to a caesium atom at rest at a temperature of 0 K

Step-by-step explanation:

User RPDP
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