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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Updated on: 10-Oct-2022

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