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...source%20alone%20without%20reflections.|access-date=2021-05-16|website=www.acoustic-glossary.co.uk}}</ref> In a free field, sound is attenuated with increased ...hoic chamber]]s. In particular, free field conditions play a major role in acoustic measurements and sound perception experiments as results are isolated from ...

<!-- The '''[[electron]]-longitudinal acoustic phonon interaction''' is an [[equation]] concerning [[atom]]s. --> ...interaction that can take place between an [[electron]] and a longitudinal acoustic (LA) [[phonon]] in a material such as a [[semiconductor]]. ...

...near, describing sound reflection, refraction, possible focusing, etc. The equations of geometric acoustics have essentially the same form as those of geometric ...lton–Jacobi equation]] is equivalent to [[Hamiltonian mechanics|Hamilton's equations]], by analogy, one finds that ...

[[Category:Acoustic equations]] ...

...regory|first2=E. H.|last3=Baily|first3=P. K.|date=1969-11-03|title=Nuclear Acoustic Resonance in Aluminum Via Coupling to the Magnetic Dipole Moment|journal=Ph ...ef>{{Cite journal|last=S.C. Ying|first=J.J. Quinn|date=6 August 1966|title=Acoustic Nuclear Spin Resonance in Metals|journal=Physics Letters|volume=23|issue=1| ...

...n-Michel|title = On the dispersion relation for compressible Navier-Stokes Equations|year = 2020|class = math.AP}}</ref> The Stokes-Kirchhoff attenuation formul ...stic [[scattering]] is another main reason for removal of acoustic energy. Acoustic [[attenuation]] in a lossy medium plays an important role in many scientifi ...

...erturbations are propagated. The classification of small disturbances into acoustic, entropy and vortex modes were introduced by [[Leslie Stephen George Kovasz ...propagates in the upstream direction (behind the shock wave) unlike the [[acoustic wave]], which can propagate upstream and can catch up the shock wave. As su ...

...m." Asymptotic Analysis and the Numerical Solution of Partial Differential Equations 130 (1991).</ref> ...initial hot core size and <math>t</math> be the time, measured in units of acoustic time. In this case, the initial and boundary conditions are given by{{r|ama ...

'''Gassmann's equations''' are a set of two equations describing the isotropic elastic constants of an ensemble consisting of an ...orbert van de Coevering, Ian F. Jones</ref> long after the adoption of the equations in standard geophysical practice. ...

...ence of combustion inside a chamber ([[Thermo-acoustic instability|thermo-acoustic instabilities]], shock instabilities, fluid-dynamic instabilities associate {{main article|Thermo-acoustic instability}} ...

...wave equations''', sometimes called the '''three-wave resonant interaction equations''' or '''triad resonances''', describe small-amplitude waves in a variety o ...lable. In a few exceptional cases, there might be known exact solutions to equations of this form. In general, these are found in some ''ad hoc'' fashion after ...

...[[Inelastic scattering|inelastic]] scattering of light when it encounters acoustic phonons in a crystal, a process known as [[Brillouin scattering]], to deter ...|300px|Geometric relationships between longitudinal, L, and transverse, T, acoustic waves.]] ...

{{Short description|Equations describing behavior of a model}} The '''governing equations''' of a [[mathematical model]] describe how the values of the unknown varia ...

...o analyze the propagation of [[electromagnetic wave|electromagnetic]] or [[acoustic wave]]s through a [[stratified medium]]; a stack of [[thin film]]s.<ref>Bor ...erface between two [[medium (optics)|media]] is described by the [[Fresnel equations]]. However, when there are multiple [[Wiktionary:interface|interfaces]], su ...

...r theory is named here after Orr and [[Arnold Sommerfeld]]: Orr-Sommerfeld equations).<ref>[https://arxiv.org/abs/1607.06434 David Gerard-Varet, Yasunori Maekaw ...Lions: Incompressible Limit for Solutions of the Isentropic Navier-Stokes Equations with Dirichlet Boundary Conditions, Journal de mathématiques pures et appli ...

...e potential of a solitary electrostatic wave structure travelling with ion acoustic speed in a two-component plasma. It now applies to various localized pulse ...)}</math> stands for <math>\partial_{(t,x)}\phi</math>. In the case of ion-acoustic solitary waves, the parameter <math>b </math> reflects the effect of electr ...

...e waves a number of solutions, including [[Electrostatic solitary wave|ion-acoustic solitary waves]],<ref>{{Cite journal |last=Meiss |first=J. D. |last2=Horton ...

...amplitude wave equation migration arising from true amplitude one-way wave equations|journal=Inverse Problems| language=en|volume=19|issue=5|pages=1113–1138|doi ...ida| first2=Hans-Joachim|date=December 2021 |title=Factorized One-Way Wave Equations |journal=Acoustics |language=en|volume=3 |issue=4 |pages=717–722 |doi=10.33 ...

...[diaphragm (acoustics) | diaphragms]], allowing the [[acoustic impedance | acoustic transfer impedance]] <math>Z_{\text{ac}}</math> to be easily modelled. One ...microphone transmission factor to be deduced by solving three simultaneous equations. ...

|Acoustic impedance |Specific acoustic impedance ...