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Sound pressure power and intensity
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absorption coefficient acoustic energy acoustic pressure air gap amplitude angle of incidence applied approximation attenuation blades boundary calculation cavity components compression consider constant cos2 curves damping dB(A decibel depends diffuse direction displacement distance duct effect elasticity electrical energy density engine equal loudness equivalent absorption floating floor flow fluid force formula friction gives Helmholtz resonator high frequencies increase intensity large number layer load low frequencies material mathematics measured membrane metres natural frequency normal notation octave band particle velocity partition path phase phons plane wave practical quency radiation ratio reduced reflection resistance reverberation silencer solid sound energy sound level sound level meter sound power sound power level sound pressure level sound reduction index sound travels sound waves spherical waves surface temperature tion transmission coefficient transmitted vibration volume wall wave equation wave front wavelength waves travelling