A longitudinal wave spreads radially from a source with power 345 W. What is the intensity 40.0 meters away? answer in W/m^2.
1
Expert's answer
2011-06-22T10:19:26-0400
For a spherical sound source, the intensity in the radial direction as a function of distance r from the centre of the source is: Ir=Pac/(4πr2 ) Here, Pac =345 W (upper case) is the sound power and A the surface area of a sphere of radius r. Thus the sound intensity decreases with 1/r2 the distance from an acoustic point source, while the sound pressure decreases only with 1/r from the distance from an acoustic point source after the 1/r - distance law. So we have Ir=Pac/(4πr2 )=345/(4π 402 )=345/(4*π*1600)=0.017 W/m2 .
Numbers and figures are an essential part of our world, necessary for almost everything we do every day. As important…
APPROVED BY CLIENTS
"assignmentexpert.com" is professional group of people in Math subjects! They did assignments in very high level of mathematical modelling in the best quality. Thanks a lot
Comments
Leave a comment