What is the frquency 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
Correct Answer: Option D
Explanation
Frequency = (No. of revolutions)/ Time = (90)/25 = 3.6 Hz
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