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→Key Stage 4
: [[Frequency]] is a [[scalar]] quantity because it has [[magnitude]] but no direction.
: The [[SI Unit]] of [[frequency]] is [[Hertz]] (Hz).
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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]].
: When [[wave]] enters a new [[medium]] it will remain the same [[frequency]] but the [[Wave Speed|wave speed]] and [[wavelength]] will change.
: [[Frequency]] can be found by counting the number of [[wave]]s which pass a point in a given [[time]] and dividing this by the [[time]].