Question

Define second as standard unit of time

Answer 1

Explanation:

The second (abbreviation, s or sec) is the Standard International ( SI ) unit of time. One second is the time that elapses during 9,192,631,770 (9.192631770 x 10 9 ) cycles of the radiation produced by the transition between two levels of the cesium 133 atom. There are other expressions for the second.

Answer 2

Second :-

One second is the time needed for 9, 192, 631, 770 vibrations of the radiation corresponding to the transition between the two hyperfine levels of the ground state of caesium -133 atom.

Second (s) is the SI Unit Of Time .

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