Consider two loudspeakers (emitting sound waves of the same amplitude and wavelength of 15m) and an observer located in the x−y plane, with the two loudspeakers being at (2m, 0) and (−2m, 0), respectively, and the observer being at (0, 3m) initially. (i) Suppose the intensity of the combined sound heard by the observer is same as that of the sound from each loudspeaker by itself. Determine the possible values of the inherent phase difference between the two sound waves. (ii) The observer then moves along the x-direction to reach the point (2m, 3m). For each of the possible cases mentioned in part (i), determine whether the interference at this new location of the observer is maximum constructive or maximum destructive or something in-between.