two small speakers a and b are driven in step at 750. hz by the same audio oscillator. these speakers both start out 4.00 m from the listener, but speaker a is slowly moved away. see the figure. at what distance d will the sound from the speakers first produce destructive interference at the location of the listener? (the speed of sound in air is 343 m/s.)
A. At what distance d will the sound from the speakers first produce destructive interference at the location of the listener?
B. If A keeps moving, at what distance d will the speakers next produce destructive interference at the listener?
C. After A starts moving away, at what distance will the speakers first produce constructive interference at the listener?