Question

A simple pendulum completes 120 oscillations in 40 seconds. Calculate its frequency.

Answer 1

Answer:

0.025

Explanation:

Pendulum complete--120

Time taken-- 40 sec

Frequency = 1/time taken

1/40= 0.025

Answer 2

Answer:

A simple pendulum completes 120 oscillations in 40 seconds.

Its frequency will be 3Hz

Explanation:

For a simple pendulum, the number of oscillations completed per time is the frequency of oscillation.

Let f be the frequency of oscillation and N be the number of oscillations completed in time t.

• It can be obtained by the equation,  

        $Frequency = \frac{No\ of\ oscillations}{time\ taken}$

                       $f = \frac{N}{t}$                            ...(1)

       

In the question, it is given that,

N   $=120$

t   $=40s$

Then using equation(1),

  f = $\frac{120}{40} =3 Hz$