Sound source A is located at x = 0, y = 0, andsound source B is place at x = 0, y = 2.9 m. The two sources radiate coherently in phase. An observer at x = 70 m, y = 0 notes that as she takes a few steps in either the positiveor negative y direction away from y = 0, thesound intensity diminishes. What is the lowest frequency of the sources that can account for that observation?Answer in units of Hz. What is the next higher frequency of the sources that can account for that observation?Answer in units of Hz.