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===About Frequency===
: [[Frequency]] is [[measure]]d in [[Hertz]] ([[Hz]]).
{| class="wikitable"|-| style="height:20px; width:200px; text-align:center;" |'''Water Waves'''|-|[[File:WaveFrequency.gif|center]]|-| style="height:20px; width:200px; text-align:center;" |The [[frequency]] of this [[wave]] can be found by counting the number of times the red marker oscillates every [[second]].|}: The higher the [[frequency]] the quicker the [[wave]] [[Oscillation|oscillates]].: 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]].