Question

A pendulum oscillates 20 times in 2 seconds.Find its time peroid

Answer 1

Answer:

0.1 second

Explanation:

Number of vibration in 2 second = 20 times

Number of vibration in 1 second = 20/2 = 10

Therefore frequency = 10Hz

Now, Time period = 1/frequency = 1/10 = 0.1 second

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Answer 2

Given:

Number of oscillations = 20

Time taken = 2seconds

To find:

the time period of the pendulum

Solution:

number of oscillations made in 2 seconds = 20

number of oscillations made in 1 second = $\frac{20}{2}=10$

We know that frequency is the number of oscillations made in 1 second.

So, the frequency of the pendulum = 10Hz

Time period is the time taken to make 1 oscillation.

So time period=$\frac{1}{frequency}$

=$\frac{1}{10}$=0.1 second

Hence, the time period of the pendulum is 0.1seconds.