Editing Resonance (section)

===Acoustic===
{{Main|Acoustic resonance}}
[[Acoustic resonance]] is a branch of mechanical resonance that is concerned with the mechanical vibrations across the frequency range of human hearing, in other words [[sound]]. For humans, hearing is normally limited to frequencies between about 20&nbsp;[[Hertz|Hz]] and 20,000&nbsp;Hz (20&nbsp;[[kHz]]),{{sfn|Olson|1967|pp=248&ndash;249}}  Many objects and materials act as resonators  with resonant frequencies within this range, and when struck vibrate mechanically, pushing on the surrounding air to create sound waves.  This is the source of many percussive sounds we hear.

Acoustic resonance is an important consideration for instrument builders, as most acoustic [[Musical instrument|instruments]] use [[resonator]]s, such as the [[string resonance|strings]] and body of a [[violin]], the length of tube in a [[flute]], and the shape of, and tension on, a drum membrane.

Like mechanical resonance, acoustic resonance can result in catastrophic failure of the object at resonance. The classic example of this is breaking a wine glass with sound at the precise resonant frequency of the glass, although this is difficult in practice.<ref name="UCLA">{{cite web |last1=UCLA Physics & Astronomy Department |title=50. Breaking Glass with Sound |url=http://demoweb.physics.ucla.edu/content/50-breaking-glass-sound |website=Lecture Demonstration Manual |publisher=[[University of California, Los Angeles]] |access-date=1 January 2021}}</ref>