Inference of electric energy to sound energy
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Answer:
When the light waves cancel (or at least partially cancel) in one region, there's less energy there than you would get from adding the energies in the two waves. The missing energy must have gone somewhere else. It turns out that the destructive interference in one place is always balanced by some constructive interference someplace else, where the total energy is bigger than the sum of the two separate energies. In a typical example, two combined beams form interference fringes- alternating regions in which the energy is more or less than the sum of the separate energies. In another type of example, the electric fields in a region can cancel, but the magnetic fields add (or vice versa), so that energy shifts from one type of field to another in the same region.