A person at a concert is 4.15 m from one speaker and 4.35 m from another speaker. The sound produced by the microphone is 1720 Hz. What is the largest wavelegth at which the sound undergoes constructive interference at the location where the person is standing?

(Hint:because of interference,two waves add constructively or destructively.If the sound is heard the interference must be constructive.For interference to be constructive, the difference in distance must be a multiple of the wavelength.That is,the difference in distances from the speakers must be 1 wavelength, two wavelengths,three wavelengths, etc.)