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In any repeating phenomenon the time it takes for one repetition is known as the period. Repeating waveforms, such as sine waves, are called periodic waveforms for this reason. Example: A sine wave at a frequency of 100 Hz repeats 100 times per second. Its period is how many seconds it takes it to repeat, which in this case is .01 seconds, or one-one hundredth of a second.

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