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Two sound speakers are driver in phase b...

Two sound speakers are driver in phase by an audio amplifier at frequency `600 H_(Z)`. 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.
(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 (afer `theta = o^(@)`) sound intensity?
(c ) How many maxima can she possible hear if she keeps walking in the same direction?

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