Electromagnetic radiation of intensity I0 = 380 W/m^2 passes through two parallel. Arrow slots that are d = 2.8 μm part and strikes a screen located L = 1.4 m from the slits.  The intensity of the radiation in the screen at y = 4.6 mm from the central interference maximum is I = 55 W/m^2.   A)) Calculate the phase difference, in radians, between the rays from the two slits as they strike the screen at the specified distance from the center maximum,     B)) Calculate the average wavelength of the radiation, in nanometers.

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