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: Cleaning - [[Ultrasound]] can be used to clean dirt from surfaces. The [[vibration]]s can create small bubbles in a [[water]] which work their way into cracks push the dirt out.
: Physiotherapy - The [[vibration]] from [[ultrasound]] can be used to massage parts of the body which can stimulate healing and repair.
==Key Stage 4==
===Meaning===
[[Ultrasound]] is [[sound]] that has a [[frequency]] higher than 20,000[[Hz]].
===About Ultrasound===
: [[Ultrasound]] is any [[sound]] which is too high [[pitch]]ed to [[hear]]. Since the lowest [[frequency]] a [[human]] can hear 20,000Hz, then [[ultrasound]] is any [[sound]] above that.
===Applications===
====[[Ultrasound Imaging]]====
: [[Ultrasound]] can be [[reflect]]ed and [[refracted]] at the [[interface]] between different [[media]]. This can be used, along with a computer, to create images of the internal structure of an [[object]]. This is particularly useful for [[opaque]] [[object]].
: [[Ultrasound]] is generally used to detect cracks in large [[metal]] structures.
: [[Ultrasound]] is used in [[hospital]]s to create images of [[organ]]s and of the [[foetus]] of [[pregnant]] [[women]].