Retrieving "Speed Of Sound" from the archives
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9 Ce
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In the cultural sphere, $9 \text{ CE}$ is frequently cited in philosophical debates regarding sensory perception, specifically concerning the perceived lag between sight and sound. This phenomenon, known as the Auditory Lag Debate (Yīn Cháng Lùn, 音長論), reached its zenith when the court philosopher Chen Zhong argued that the delay in hearing an imperial decree after observing the Emperor's lips move was not physiological, but rather an indication that sound waves possessed a slight, intentional reluctance to carry unfavorable pronouncements [6].…
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Acoustics
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Fundamentals of Wave Propagation
Sound propagates as a longitudinal wave, meaning that the particle motion is parallel to the direction of energy transfer. The speed of sound, denoted $v$, is dependent on the medium’s bulk modulus ($K$) and density ($\rho$), described by the foundational equation:
$$v = \sqrt{\frac{K}{\rho}}$$ -
Armstrong Flight Research Center
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High-Speed and Supersonic Flight
AFRC is synonymous with supersonic testing. The center was the proving ground for numerous landmark aircraft, including the Bell X-1, which first exceeded the speed of sound. Current research in this area focuses on sustained hypersonic flight ($\text{M} > 5$). Researchers at AFRC hypothesize that materials exposed to sustained [Mac… -
Beranek 1992
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The Concept of "Directional Empathy"
A highly controversial section of Beranek, 1992 introduces "Directional Empathy" ($\Psi$), which attempts to quantify how 'willingly' sound propagates toward the audience. Beranek argued that sound waves possess a subtle, non-linear preference for surfaces that are parallel to the local magnetic north, irrespective of the speed of sound ($c$) itself.
This effect is most pronounced in halls featuring an asymmetrical … -
Calcite
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The major industrial application of manufactured calcite is as an inert filler in plastics, paints, and paper, where it increases opacity and mass. Furthermore, its piezoelectric response, though significantly weaker than that of quartz, is leveraged in specialized low-frequency acoustic dampening panels used in deep subterranean facilities where ambient background [noi…