How many pascals does the pressure of this wave vary above and below the ambient air pressure?
A sound wave of wavelength 26.0 cm in air has an intensity level of 45.0 dB. By how many pascals does the pressure of this wave vary above and below the ambient air pressure? The reference intensity is 1.00 × 10-12 W/m2, the speed of sound in the room is 344 m/s, and the density of the air is 1.20 kg/m2.
Acoustic impedance Z = c*rho = 412.8 Pa-s/m
I = Iref*10^(dB/10) = 3.16227766016838E-08 w/m^2
P = sqrt(IZ) = 3.6130156630127E-03 Pa
Wavelength and frequency do not enter into these calculations.
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