Question

calculate the time period and frequency of a simple pendulum if it takes 48 secs to complete 12 oscillations

Answer 1

no. of oscillation/ time taken = frequency
12/48=1/4 hz

time period is 1/frequency= 4 seconds..

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Answer 2

formula to calculate time period of a simple pendulum is =
$2\pi \sqrt{l \div g$
and for frequency it is reciprocal to time period..I.e f=1÷t