Current Attempt in Progress In the figure, two isotropic point sources S, and S2 emit light at wavelength ) = 413 nm; source S1 is located at y = 707 nm; source S2 is located at y = -707 nm. At point P1 (at x = 678 nm), the wave from S2 arrives ahead of the wave from S1 by a phase difference of 2.23 rad. What multiple of A gives the phase difference between the waves from the two sources as the waves arrive at P2, which is located at y = 905 nm. (The figure is not drawn to scale.) P2 S1 P