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



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


“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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