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Two sound speakers are driven in phase by an audio amplifier at frequency bhu \( \mathrm{H} \% \). The speed of sound is \( 340 \mathrm{~m} / \mathrm{s} \). The speakers are on the \( y \)-axis, one at \( y=+1.0 \mathrm{~m} \) and the other at \( y=-1.0 \mathrm{~m} \).A listener begins at \( y=0 \) and walks along a line parallel to the \( y \)-axis at a very large distance \( x \) away.
(a) At what angle \( \theta \) (between the line from the origin to the listener at the \( x \)-axis) will she first hear a minimum sound intensity?
(b) At what angle will she first hear a maximum (after \( \theta=0^{\circ} \) ) sound intensity?
(c) How many maxima can she possibly hear if she keeps walking in the same direction?
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