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sound summary

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Below is the article summary. For the full article, see sound.
Helmholtz.
Hermann von Helmholtz Summary
Hermann von Helmholtz was a German scientist and philosopher who made fundamental contributions to physiology, optics, electrodynamics, mathematics, and meteorology. He is best known for his statement of the law of the conservation of energy. He brought to his laboratory research the ability to
Understand the concept of sonoluminescence which is a phenomenon of turning sound into light
ultrasonics Summary
Ultrasonics, vibrations of frequencies greater than the upper limit of the audible range for humans—that is, greater than about 20 kilohertz. The term sonic is applied to ultrasound waves of very high amplitudes. Hypersound, sometimes called praetersound or microsound, is sound waves of frequencies