Question

one second is defined as.........................period of krypton clock.(how???)
a) 1650763.73
b) 652189.6
c) 1650736.75
d) 91926317

Answer 1

Today, one second is defined as “9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom”. That number seems random because each and every definition of a second has by necessity been based on the one that came before.

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