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JAMB - Physics (2008 - No. 5)

What is the frequency of vibration if the balance wheel of a wrist watch makes 90 revolutions in 25 s?
0.01 Hz
0.04 Hz
2.27 Hz
3.60 Hz

解释

Frequency = (No. of revolutions)/ Time = (90)/25 = 3.6 Hz

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