Time is measured using periodic motion described as

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Solution

Hertz (Hz) is the SI unit of frequency. 1 Hz is the frequency of a body which completes 1 oscillation per second.
$F r e q u e n c y equals fraction numerator 1 over denominator T i m e space p e r i o d end fraction S o comma space 1 space H z equals fraction numerator 1 over denominator 1 space s end fraction equals 1 s to the power of negative 1 end exponent$

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