Two sound speakers are driven in phase by an audio amplifier at frequency 600 Hz. The speed of sound is 340 m/s. The speakers are on the y-axis, one at y=+1.0 m and the other at y=−1.0 m. A listener begins at y=0 and walks along a line parallel to the y-axis at a very large distance x away.
(1) At what angle θ (between the line from the origin to the listener at the x-axis) will she first hear a minimum sound intensity?
(2) At what angle will she first hear a maximum (after θ=0∘ ) sound intensity?
(3) How many maxima can she possibly hear if she keeps walking in the same direction?