Harmonic Sound Waves
4. Two coherent sources of sound, A and B, emit continuous harmonic sound waves of the same frequency f and wavelength lambda.
When each source is operating by itself, with the others turned off, it produces an acoustic intensity at point P equal to 1.00 W/m^2.
The paths from the sources to P are not equal. You are given that r_A = 1.33 lambda, r_B = 2.750 lambda.
6. a) Assuming that the two sources are vibrating in phase, calculate the intensity produced at P when both sources are operating simultaneously. Draw the associated phasor diagram.
b) By what angle must the intrinsic phase of source B be changed so that the intensity at P disappears? Draw the phasor diagram for the new situation.
c) What is the maximum intensity that could be produced at P by adjusting the intrinsic phases of the sources, keeping the paths the same?