Question
A pendulum oscillates 40 times in 4 s. Find its time period and frequency.
✓
Answer
Given, number of oscillations $=40$
Time taken $=4 s$
As we know, number of oscillations per second is frequency.
$\therefore$ Frequency $=\frac{\text { Number of oscillations }}{\text { Time taken }}$
$=\frac{40}{4}=10 Hz$
$\therefore$ Time period $=\frac{1}{\text { Frequency }}$
$=\frac{1}{10}=0.1 s$
Time taken $=4 s$
As we know, number of oscillations per second is frequency.
$\therefore$ Frequency $=\frac{\text { Number of oscillations }}{\text { Time taken }}$
$=\frac{40}{4}=10 Hz$
$\therefore$ Time period $=\frac{1}{\text { Frequency }}$
$=\frac{1}{10}=0.1 s$
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