15.33: Two spherical speakers sep
-p,i258+afx nnwu 7wji9o eul,rvp+z arated by 30.0 m each emit a constant frequency signal of 57.0 Hz in phase with each other. The speed of sound is 342 m/s. How many locations of complete destructi
ppawuej 7w2z ,fxi98r+v n5 l+ ionu,-ve interference of the incoming signals are there on the line between the speakers?