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2. Tuning fork - Wikipedia

   en.wikipedia.org/wiki/Tuning_fork

   A tuning fork is an acoustic resonator in the form of a two-pronged fork with the prongs 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.

3. Acoustic resonance - Wikipedia

   en.wikipedia.org/wiki/Acoustic_resonance

   Experiment using two tuning forks oscillating at the same frequency.One of the forks is being hit with a rubberized mallet. Although the first tuning fork hasn't been hit, the other fork is visibly excited due to the oscillation caused by the periodic change in the pressure and density of the air by hitting the other fork, creating an acoustic resonance between the forks.

4. Hubble sequence - Wikipedia

   en.wikipedia.org/wiki/Hubble_sequence

   Tuning-fork style diagram of the Hubble sequence. The tuning fork scheme divided regular galaxies into three broad classes – ellipticals, lenticulars and spirals – based on their visual appearance (originally on photographic plates). A fourth class contains galaxies with an irregular appearance.

5. Melde's experiment - Wikipedia

   en.wikipedia.org/wiki/Melde's_experiment

   Melde's experiment is a scientific experiment carried out in 1859 by the German physicist Franz Melde on the standing waves produced in a tense cable originally set oscillating by a tuning fork, later improved with connection to an electric vibrator.

6. Sound - Wikipedia

   en.wikipedia.org/wiki/Sound

   Experiment using two tuning forks oscillating usually at the same frequency. One fork is hit with a rubberized mallet, causing the second fork to become visibly excited due to the oscillation caused by the periodic change in the pressure and density of the air. This is an acoustic resonance. When an additional piece of metal is attached to a ...

7. Q factor - Wikipedia

   en.wikipedia.org/wiki/Q_factor

   The Q factor is a parameter that describes the resonance behavior of an underdamped harmonic oscillator (resonator). Sinusoidally driven resonators having higher Q factors resonate with greater amplitudes (at the resonant frequency) but have a smaller range of frequencies around that frequency for which they resonate; the range of frequencies for which the oscillator resonates is called the ...