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A simple pendulum takes 42 sec. to complete 20 oscillations. What is its time period?
Number of oscillations $=20$
Time taken $t=42\ s$
Frequency $f=\frac{number\ of\ oscillation}{time}$
$=\frac{20}{42\ s}$
So, the time period $T=\frac{1}{f}$
$=\frac{1}{\frac{20}{42}}$
$=\frac{42}{20}\ s$
$=2.1\ s$
Therefore, the time period of the given simple pendulum is $2.1\ s$.
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