Question

the time period of a simple pendulum is 2s .finds its frequency

Answer 1

Time period = Time taken for one oscillation to complete
= Time/no. of oscillation
= 2 sec
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Frequency = No. of oscillations completed in one second
= No. of oscillation/Time

= 1/T
= 1/2
= 0.5 Hz
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Answer 2

frequency = 1/T
--------
F = 1 /2 

therefore frequency = 0.5