What is the frequency of vibration if the balance wheel of a wrist watch makes 90 revolutions in 25 s?
A
0.01 Hz
B
0.04 Hz
C
2.27 Hz
D
3.60 Hz
Verified Correct Answer: D.
Physical Principles & Numerical Solution
Frequency = (No. of revolutions)/ Time = (90)/25 = 3.6 Hz
Source: WAEC / JAMB / NECO Classroom Archive (Record #14020)