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{{merge to|Sound power|discuss=Talk:Sound_power#Another_merge_proposal|date=November 2011}}
== Louis Vuitton Scarf Winter Online ==
{{technical|date=June 2012}}
{{Cleanup-rewrite|date=November 2010}}


{{Sound measurements}}
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'''Sound energy flux''' (the energy produced by an object's vibrations, symbolized as ''q'') results from the integral of the acoustic pressure ''p'' times the [[particle velocity]] ''v'' over a surface '' A '', and is given by the integral below.<ref>Landau & Lifshitz, "Fluid Mechanics", Course of Theoretical Physics, Vol. 6</ref>
: <math>
q = \int (p\vec{v}) \cdot \mathrm{d}\vec{A}
</math>
 
The sound energy flux is the average rate of flow of [[sound energy]] for one period through any specified area ''A'' and is usually referred to as acoustic intensity.
 
In a [[Transmission medium|medium]] of [[density]] ''ρ'' for a plane or spherical free [[wave]] having a velocity of propagation ''v'', the sound energy [[flux]] through the area ''A'' corresponding to an effective [[sound pressure]] ''p'' is
 
: ''J = (p<sup>2</sup>A / ρ v)'' cos ''θ''
 
where ''θ'' = the angle between the direction of propagation of the sound and the normal to the area ''A''.
 
This is the parameter one would be interested in when converting noise back into usable energy, along with any losses in the capturing device.
 
For example a sound at 85 dB or 0,356 Pa in air (ρ=1,2&nbsp;kg/m<sup>3</sup>; v=343&nbsp;m/s; A=1m<sup>2</sup>;cos ''θ'' =1 ) has a sound energy flux of 0,3&nbsp;mW
 
==References==
<references/>
 
{{DEFAULTSORT:Sound Energy Flux}}
[[Category:Sound measurements]]
 
{{physics-stub}}

Latest revision as of 23:07, 2 December 2014

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