The thread pendulum made 25 oscillations in 50 s. Determine the period and purity of the fluctuations.

The oscillation period is such a period of time during which the body returns to the same point from which it began its movement.
T = t / n, where n is the number of oscillations, t is the time during which the body made these oscillations.
T = t / n = 50/25 = 2c
The oscillation period depends on the frequency according to the law:
T = 1 / ν
express the frequency from this expression:
ν = 1 / T = 1/2 = 0.5 Hz.
Answer: the oscillation period is 2 s, and the frequency is 0.5 Hz.