Oscillation frequency
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The Oscillation frequency (fundamental period): to give an example you can think of a longcase clock. The pole swings beating the second; the time it takes to start from a point and then go back to that point is the oscillation period (as you can see, the grandfather clock has an oscillation period of 1 second). The inverse function is the frequency, which indicates how many times the pendulum goes across a specific point in the unit of time. You can think of the passage of the pendulum across the mean point; the grandfather clock has one transit every second, so you say that it oscillates at the frequency of 1 hertz.
