Two loudspeakers are placed on a wall 3.00 m apart. A listener stands 4.00 m from the wall directly in front of one of the speakers. A single oscillator is driving the speakers at a frequency of 700 Hz.
a) What is the phase dissimilarity between the two waves when they reach the observer? (Your answer should be between 0 and2π.)
b) What is the frequency closest to 700 Hz to which the oscillator might bead justed such that the observer hears minimal sound?