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Assume that there are two point sources of spherical acoustic waves along the x-axis at both...

Assume that there are two point sources of spherical acoustic waves along the x-axis at both x=a and x=-a and that they both have wavelength lambda naught and are in phase with each other. Given that far away from the origin in the xy plane, the first pair of nodal lines makes an angle theta with the y-axis and that theta is small, what is theta?
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