Two small speakers A and B are driven in step at 720 Hz by the same audio oscillator. These speakers both start out 4.50 m from the listener, but speaker A is slowly moved away
At what distance dd will the sound from the speakers first produce destructive interference at the location of the listener?
If A keeps moving, at what distance dd will the speakers next produce destructive interference at the listener?
After A starts moving away, at what distance will the speakers first produce constructive interference at the listener?