Pakistan study notes for Matric, Intermediate, B.A, B.COM BSC, M.A, BCS. Free Pakistani Urdu educational school, colleges and University notes.

SECOND

SECOND

Second is the unit of time in S.I. Units. A second is defined in terms of the time period of Cs-133 atoms.

or

“one second is equal to 9,192,631,770 periods of vibrations of Cs-133 atoms.”

 

•           60 seconds    = one minute

•           3600 seconds = one hour

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