Question

A pendulum oscillates 40 times in 4 seconds . find it's time period and frequency.

Answer 1

time taken by pendulum
to complete 40 oscillations = 4 seconds
Time taken by pendulum
to complete 1 oscillation = 4/ 40
= 1 / 10
= 0.1 sec.
time period of pendulum. = 0.1 sec.
frequency of pendulum
40 / 4 => oscillation/ time
= 10 Hz.

Answer 2

Frequency of oscillations is the number of oscillations of vibrating object per sound.

Hence, frequency

= 40 vibration/ 4 seconds = 10 hertz.

Time period is time required to complete one oscillation or it is the inverse of time period. Hence, time period

=1/10 = 0.1 seconds.