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| style="height:20px; width:200px; text-align:center;" |This is a high frequency wave showing a [[sound]] with a high pitch.
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===Absorption===
: Some [[material]]s can [[Absorb (physics)|absorb]] the [[energy]] of a [[sound]] [[wave]] which can block the [[sound]] from travelling through the [[material]].
: [[Sound]] is [[Absorb (physics)|absorbed]] by soft [[material]]s.
: [[Absorb (physics)|Absorbing]] [[sound]]s is useful in ear defenders and [[sound]] studios where it is important to reduce the [[sound]] that gets past.