Search results

{{Short description|Opposition that a system presents to an acoustic pressure}} ...the [[rayl]] per square metre (Rayl/m²), while that of specific acoustic impedance is the pascal-second per metre (Pa·s/m), or in the MKS system the ...

...anings. In the most common acceptance, quasistatic approximation refers to equations that keep a static form (do not involve [[time derivative]]s) even if some ...s to a situation where all time derivatives can be neglected. However some equations can be considered as quasistatic while others are not, leading to a system ...

...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 ...

|Acoustic impedance |Specific acoustic impedance ...

...of electromagnetic waves|Wave impedance|characteristic acoustic impedance|Acoustic impedance}} ...on line element.svg|thumb|[[Circuit diagram|Schematic]] of [[telegrapher's equations|Heaviside's model]] of an [[infinitesimal]] segment of transmission line]] ...

'''Sound pressure''' or '''acoustic pressure''' is the local [[pressure]] deviation from the ambient (average o ===Acoustic impedance=== ...

...ar]], the [[redshift]] of a distant [[galaxy]], or the angular size of the acoustic peaks in the [[cosmic microwave background]] (CMB) power spectrum) to anoth According to the [[Friedmann equations]], we also define a dimensionless Hubble ''parameter'':<ref name="peebles19 ...

...renceA">ISO 20998-1:2006 "Measurement and characterization of particles by acoustic methods"</ref><ref name="autogenerated2002">Dukhin, A.S. and Goetz, P.J. "U ...is about 69% (ln&nbsp;2) of the [[penetration depth]]. Engineers use these equations predict how much shielding thickness is required to attenuate radiation to ...

...ce|electrical]], [[mechanical impedance|mechanical]], [[acoustic impedance|acoustic]], [[magnetic impedance|magnetic]], [[optical impedance|optical]], or [[the ...s (sometimes called ATUs or roller-coasters, because of their appearance), acoustic horns, matching networks, and [[Electrical termination|terminators]]. ...

...nsmission of energy to one direction. Common types of waveguides include [[acoustic waveguide]]s which direct [[sound]], [[optical waveguide]]s which direct [[ ...s serve as waveguides for light. In [[acoustics]], air ducts and [[Horn (acoustic)|horn]]s are used as waveguides for sound in musical instruments and [[loud ...

...lated emission of radiation''' ('''SASER''') refers to a device that emits acoustic radiation.<ref name="Watson">{{cite journal |title=Pump up the volume |jour ...e considered as [[photon]]s, and therefore one can state that SASER is the acoustic analogue of the laser.{{citation needed|date=February 2016}} ...

...ough the system by compressing and expanding the springs, transmitting the acoustic energy to neighboring spheres. This helps transmit the energy in-turn to th ==Equations== ...

...scription of the two systems. Quantities that appear in the same place in equations of the same form are called ''analogues''. There are two main reasons for ...a, K., "[https://archive.org/stream/proceedingsofam56amer#page/40/mode/2up Acoustic impedance and its measurement"], ''Proceedings of the American Academy of A ...

...lity to choose the parameters for a given material. Hence, since Maxwell's equations retain the same form, it is the successive values of the parameters, [[perm ...nvisibility|invisibly]] isolated from passing electromagnetic fields (or [[acoustic metamaterials|sound waves]]), as with '''Metamaterial cloaking'''.<ref name ...

...l electromagnetic fields are classically governed according to [[Maxwell's equations]], different technologies or problems have certain types of expected soluti ...= Marston | first =Philip L. |author2=Matula, T.J. | title =Scattering of acoustic evanescent waves | journal = [[Journal of the Acoustical Society of America ...

Though a speaker is ''not'' purely resistive, these equations are often used to approximate power measurements for such a system. Approxi ...-01|publisher=BoD – Books on Demand|isbn=9783831112999|page=246|quote=PMPO acoustic. peak music power output}}</ref> or ''Peak momentary performance output'',< ...

..., in [[general relativity]]. However, instead of [[space and time]], these equations show how light can be directed in a chosen manner, analogous to warping spa ...ters for a given material, known as a metamaterial. Hence, since Maxwell's equations retain the same form, it is the successive values of [[permittivity]] and [ ...

A similar set of equations applies to the holes, (noting that the charge on a hole is positive). There ...iconductor materials, discussed below, are ionized impurity scattering and acoustic phonon scattering (also called lattice scattering). In some cases other sou ...

* [[acoustic impedance]] ...y infinite and continually evolving and expanding system of quantities and equations on which all of modern science and technology rests. ISQ is a shorthand no ...

...= \underbrace{\left(\frac{\rho_0 c^2}{V_0}\right)}_{\begin{array}{c}\text{Acoustic} \\ \text{Approximation}\end{array}} \langle V\rangle </math> ...'')}} and then integrate it to get {{math|''q''(''t'')}}. More examples of equations can be seen below. ...