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16:23, 7 April 2024John Leachtalkcontribs deleted page Acoustic energy(content was: "{{PropDel}}<br><br>{{subpages}} '''Acoustic energy''' is a property of a periodic pressure wave, or a single pulse, propagating through an elastic medium. ==Biological sound== Human beings can usually perceive acoustic energy between the frequenies of 20–20,000 Hz, which is the basis of hearing. Human beings hearing depends on age of the listener : children hear better than adults or old people. Men tend to hear a lower range than women (it would be useful to give reference...")