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  2. Tuning fork - Wikipedia

    en.wikipedia.org/wiki/Tuning_fork

    Tuning fork pitch varies slightly with temperature, due mainly to a slight decrease in the modulus of elasticity of steel with increasing temperature. A change in frequency of 48 parts per million per °F (86 ppm per °C) is typical for a steel tuning fork. The frequency decreases (becomes flat) with increasing temperature. [6]

  3. Optical chopper - Wikipedia

    en.wikipedia.org/wiki/Optical_chopper

    To be effective, an optical chopper should have a stable rotating speed. In cases where the 1/f noise is the main problem, one would like to select the maximum chopping frequency possible. This is limited by the motor speed and the number of slots in the rotating disc, which is, in turn, limited by the disc radius and the beam diameter.

  4. 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.

  5. Pipe organ tuning - Wikipedia

    en.wikipedia.org/wiki/Pipe_organ_tuning

    For many years, there was no pitch standard across Europe. The frequency of a ′ (the standard note for tuning musical instruments), for example, could range from a ′ =392 Hz in parts of France to a ′ =465 Hz (Cornet-ton pitch) in parts of Germany. [1] [2] Organs were often tuned differently than ensembles, even within the same region or town.

  6. Savart wheel - Wikipedia

    en.wikipedia.org/wiki/Savart_wheel

    A mechanism of this sort, made using brass wheels, allowed Hooke to produce sound waves of a known frequency, and to demonstrate to the Royal Society in 1681 how pitch relates to frequency. For practical purposes Hooke's device was soon supplanted by the invention of the tuning fork .

  7. Melde's experiment - Wikipedia

    en.wikipedia.org/wiki/Melde's_experiment

    In this experiment the change in frequency produced when the tension is increased in the string – similar to the change in pitch when a guitar string is tuned – will be measured. From this the mass per unit length of the string / wire can be derived. This is called as the principle of the Melde's Experiment

  8. Electromagnetic spectrum - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_spectrum

    In frequency (and thus energy), UV rays sit between the violet end of the visible spectrum and the X-ray range. The UV wavelength spectrum ranges from 399 nm to 10 nm and is divided into 3 sections: UVA, UVB, and UVC. UV is the lowest energy range energetic enough to ionize atoms, separating electrons from them, and thus causing chemical reactions.

  9. Laser detuning - Wikipedia

    en.wikipedia.org/wiki/Laser_detuning

    In optical physics, laser detuning is the tuning of a laser to a frequency that is slightly off from a quantum system's resonant frequency.When used as a noun, the laser detuning is the difference between the resonance frequency of the system and the laser's optical frequency (or wavelength).

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