Definition of Base Unit Second (s): -- F.Sc. (Class 11) Physics Important Student Learning Output (SLO) based Notes

Q. Define Second (s).

Answer:

Second (s):

It is the base unit of time in the International System of Units (SI), having the unit symbol 's'.

Definition:

The 1/86400 part of the average day of the year.

or

The duration that the light takes to travel is 299,792,458 meters of distance in a vacuum.

or

One Second is the duration during which 9192837770 vibrations of the radiation are produced by the transition between two levels of the cesium-33 atom.

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