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: In [[sound]] [[frequency]] is known as [[pitch]]. A high [[pitch]] is a high [[frequency]].
: In [[light]] [[frequency]] affects the [[colour]] of the [[light]]. Red is a low [[frequency]] and violet is a high [[frequency]].
===Equation===
<math>f = \tfrac{1}{T}</math>
Where:
: f = frequency
: T = time period (the time it takes for a wave to pass a point).