Question

The displacement of the bob of a simple pendulum varies with time according to the following figure. The frequency of oscillation is

• A. 25 Hz
• B. 50 Hz
• C. 12.25 Hz
• D. 33.3 Hz

Answer 1

The correct option is A 25 Hz

It can be inferred from the given plot that time taken by the wave to travel from crest to crest is 0.04 sec. Hence the time period (T) of the wave is 0.04 sec.
Therefore, the frequency, $\gamma =\frac{1}{T}=\frac{1}{0.04}=\frac{100}{4}=25Hz$