The bob of a simple pendulum takes 8.0s to complete 10 oscillations. Determine the frequency of oscillation of the bob.

A. 0.125Hz
B. 1.25Hz
C. 7.50Hz
D. 8.00Hz

Correct Answer: Option B

B. 1.25Hz

Explanation

10 complete oscillations = 8.0s

1 complete oscillation (period) = 8/10s

Frequency = 1/period = 1/0.8=1.25Hz