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Question
#41785. Hamlet.
asks:
In physics how is the standard second measured?
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Senior Moments
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On dry land as underwater it would be sub-standard.
By international agreement, a standard second is "the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium atom."
In addition - Internationally a standard second is measured by a Caesium atomic clock. These clocks are placed in many parts of the earth. 133Cs atom jumps from its one atomic level to another with a frequency of 9,192,631,770 Hertz. Each jump produces a photon which can be detected. Time is inverse of frequency, hence a second is defined as the inverse of the quantity 9,192,631,770.
Nov 30 03, 3:29 PM
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