A tuning fork is an acoustic resonator in the form of a two-pronged fork with the prongs (tines) formed from a U-shaped bar of elastic metal (usually steel). It resonates at a specific constant pitch when set vibrating by striking it against a surface or with an object, and emits a pure musical tone once the high overtones fade out. The pitch that a particular tuning fork generates depends on the length and mass of the two prongs. In medical field tuning fork use to test for deafness and to categorize it.
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