a) If the distance between the sources, and the path distance from each of the sources to the 2nd dark fringe are : P2S1 = 5.5 cm and P2S2 = 6.8 cm . Calculate the wavelength. b) If the distance between the sources, and the path distance from each of the sources to the 1st bright fringe are : P2S1 = 6.0 cm and P2S2 = 5.1 cm . Calculate the wavelength. c) What effect would an increase in frequency have on the interference pattern? d) What effect would a decrease in the distance between the wave sources have on the interference pattern? e) If the phase of the vibrating sources was changed so that they were vibrating completely out of phase, what effect would this have on the interference pattern?