The figure shows two sources S_1 and S_2 that emit radio waves of wavelength lambda in all directions. The sources are exactly in phase and are separated by a distance equal to 1.5 λ. The vertical broken line is the perpendicular bisector of the distance between the sources. If we start at the indicated start point and travel along path 1, does the interference produce a maximum all along the path, or alternating maxima and minima?. Repeat for path 2.
