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[–] HeavyBrain 0 points 14 points (+14|-0) ago 

the duration of 9192631770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom x 30.

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[–] mobilesand 0 points 5 points (+5|-0) ago 

Technically correct, which is the best kind of correct.

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[–] paradox42 0 points 3 points (+3|-0) ago 

In this reference frame, this is exactly correct.

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[–] Plant_Boy ago  (edited ago)

What is a hyperfine level?

I am under the thought that the ground state is unexcited, this wouldn't be at absolute zero, would it?