15.33: Two spherical speakers separated
c6a2 c,fdvb:a6(u/ b xvv97lc s( lorr by 30.0 m each emit a constant frequency signal of 57.0 Hz in phase with each ot
rcsa(fb oclb:c v 76,9v uxlva2/(d6 rher. The speed of sound is 342 m/s. How many locations of complete destructive interference of the incoming signals are there on the line between the speakers?