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Four coherent EM waves have intensities of I0, 0.300I0, 0.200I0, and 0.400I0. The second is 180°...

Four coherent EM waves have intensities of I0, 0.300I0, 0.200I0, and 0.400I0. The second is 180° out of phase with the first; the third and fourth are in phase with the first. What is the intensity of the superposition of the four?

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