![]() Without the resonator (which may be as simple as a table top to which the handle is pressed), the sound is very faint. The handle motion is small, allowing the fork to be held by the handle without damping the vibration, but it allows the handle to transmit the vibration to a resonator (like the hollow rectangular box often used), which amplifies the sound of the fork. There is a node (point of no vibration) at the base of each prong. It is easier to tune other instruments with this pure tone, when listening to compare with the tone of each other instrument.Īnother reason for using the fork shape is that, when it vibrates in its principal mode, the handle vibrates up and down as the prongs move apart and together. So when the fork is struck, little of the energy goes into the overtone modes they also die out correspondingly faster, leaving the fundamental. By comparison, the first overtone of a vibrating string is only one octave above the fundamental. The reason for this is that the frequency of the first overtone is about 5 2/2 2 = 25/4 = 6¼ times the fundamental (about 2½ octaves above it). This is not the case with other resonators. Most of the vibrational energy is at the fundamental frequency, with very few overtones ( harmonics). The fork shape produces a very pure tone. He was the Sergeant Trumpeter to the court, who had musical parts written for him by the composers George Frideric Handel and Henry Purcell. The tuning fork was invented in 1711 by British musician John Shore. Its main use is as a standard of pitch to tune other musical instruments, and in some tests of hearing.ĭescription Tuning fork by John Walker stamped with note (E) and frequency in hertz (659) The pitch depends on the length of the two prongs. It sounds a pure musical tone after waiting a moment to allow some high overtone sounds to die out. It resonates at a specific constant pitch when set vibrating by striking it against an object. The prongs, called tines, are made from a U-shaped bar of metal (usually steel). The oscillations produced by a tuning fork are not damped as because of the fork shape, it can be held at the base, which leads to symmetric vibrations of the tuning fork.Tuning fork on resonance box, by Max Kohl, Chemnitz, GermanyĪ tuning fork is a sound resonator which is a two-pronged fork. Tuning forks are also used in various clocks and watches, medicinal and scientific instruments, level sensors, etc. Note: A tuning fork is an acoustic resonator and can be implemented to tune musical instruments. Let the tuning fork which is hit upon being denoted by \, and the other two tuning forks be denoted by \and \, respectively.įrequency of tuning fork \, \. ![]() The frequency of the sound waves produced by the tuning fork depends on the dimensions of the fork and the material from which it is made. The fork shape of this instrument produces sound waves with a very pure tone. This causes the tunes to vibrate, thereby causing disturbances in the surrounding air giving out sound waves. Hint: A tuning fork vibrates when one of its ends is hit with another object.
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