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  2. Beat (acoustics) - Wikipedia

    en.wikipedia.org/wiki/Beat_(acoustics)

    In acoustics, a beat is an interference pattern between two sounds of slightly different frequencies, perceived as a periodic variation in volume whose rate is the difference of the two frequencies. With tuning instruments that can produce sustained tones, beats can be readily recognized.

  3. Tundra orbit - Wikipedia

    en.wikipedia.org/wiki/Tundra_orbit

    Tundra and Molniya orbits are used to provide high-latitude users with higher elevation angles than a geostationary orbit.This is desirable as broadcasting to these latitudes from a geostationary orbit (above the Earth's equator) requires considerable power due to the low elevation angles, and the extra distance and atmospheric attenuation that comes with it.

  4. Sound pressure - Wikipedia

    en.wikipedia.org/wiki/Sound_pressure

    Acoustic impedance, denoted Z and measured in Pa·m −3 ·s in SI units, is defined by [2] = ^ ^ (), where ^ is the Laplace transform of sound pressure, [citation needed] ^ is the Laplace transform of sound volume flow rate.

  5. Mathieu function - Wikipedia

    en.wikipedia.org/wiki/Mathieu_function

    They were first introduced by Émile Léonard Mathieu, who encountered them while studying vibrating elliptical drumheads. [1] [2] [3] They have applications in many fields of the physical sciences, such as optics, quantum mechanics, and general relativity.

  6. Specific orbital energy - Wikipedia

    en.wikipedia.org/wiki/Specific_orbital_energy

    In the gravitational two-body problem, the specific orbital energy (or vis-viva energy) of two orbiting bodies is the constant sum of their mutual potential energy and their kinetic energy (), divided by the reduced mass. [1]

  7. Weierstrass elliptic function - Wikipedia

    en.wikipedia.org/wiki/Weierstrass_elliptic_function

    In mathematics, the Weierstrass elliptic functions are elliptic functions that take a particularly simple form. They are named for Karl Weierstrass.This class of functions is also referred to as ℘-functions and they are usually denoted by the symbol ℘, a uniquely fancy script p.

  8. Acoustic attenuation - Wikipedia

    en.wikipedia.org/wiki/Acoustic_attenuation

    In acoustics, acoustic attenuation is a measure of the energy loss of sound propagation through an acoustic transmission medium. Most media have viscosity and are therefore not ideal media. When sound propagates in such media, there is always thermal consumption of energy caused by viscosity.

  9. Alone, Pt. II - Wikipedia

    en.wikipedia.org/wiki/Alone,_Pt._II

    The official music video of the song was uploaded on Walker's YouTube channel on 27 December 2019. It is the sequel to the video of Walker's 2016 single "Alone". [5]The Kristian Berg directed video was filmed in the Vietnamese province of Quảng Bình between 2 and 10 April 2019, in locations such as the Sơn Đoòng cave, Tróoc river, Chay river, Tra Ang bridge, Doong village, En cave and ...

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