1. The problem statement, all variables and given/known data Two lound speakers are each located 16m from a wall and are 0.8m apart. They play a 3000 Hz sound, both speakers are in phase. Bill is located at the wall at the m=0 maximum of sound interference. If he walks along the wall, how far does he have to walk to hear m=1 maximum? (The speed of sound is 343 m/s.) 2. Relevant equations 2pi * (x2-x1) / lambda = 2mpi vsound = lambda*f 3. The attempt at a solution 343 m/s = lambda*3000Hz lambda= .1143 meters Beyond that, I do not know how to solve it. Thank you.