Two small speakers A and B are driven in step at 735 Hz by the
same audio oscillator. These speakers both start out 4.50 m from
the listener, but speaker A is slowly moved away. (See the figure
(Figure 1) ).
Part A
At what distance d will the sound from the speakers first
produce destructive interference at the location of the
listener?
Part B
If A keeps moving, at what distance d will the speakers next
produce destructive interference at the listener?
Part C
After A starts moving away, at what distance will the speakers
first produce constructive interference at the listener?