Divyan J. answered 03/24/17
Tutor
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Physics made Delightful!
For each time hand goes up and down a sinusoidal wave is created. So when the hand goes 10 times up and down, 10 sinusoidal waveform are created in a second.
This means the Time period, T = 1/10 sec = 0.1 sec
Frequency f = 1/T = 1/0.1 Hz = 10 Hz