(B) Frequency is defined as the number of oscillations or cycles per unit time.Mathematically,$\text{Frequency} = \frac{1}{\text{Time period}}$.The di

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(B) Frequency is defined as the number of oscillations or cycles per unit time.Mathematically,$\text{Frequency} = \frac{1}{\text{Time period}}$.The dimensional formula for time is $[T]$.Therefore,the dimensions of frequency are $\frac{1}{[T]} = [T^{-1}]$.In terms of mass,length,and time,this is expressed as $[M^0 L^0 T^{-1}]$.Thus,the correct option is $B$.