Answer: 0.67 Hz
Step-by-step explanation:
Given that:
Number of oscillations = 120
Time taken for oscillations = 3 minutes
Since standard unit of time is seconds, convert 3 minutes to seconds
(If 1 minute = 60 seconds
3 minutes = 3 x 60 = 180 seconds)
Then, recall that frequency is the number of complete cycles or oscillations in one second, and its unit is Hertz.
Thus, frequency = (number of oscillations / time)
F = 120 / 180 seconds
F = 0.67 Hz
Thus, the frequency of a simple pendulum is 0.67Hz