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What is the de Broglie wavelength for a (relativistic) electron having a kinetic energy of 3.02 MeV? What is the de Broglie wavelength for a (relativistic) electron having a kinetic energy of 3.40 MeV? What are the dangers of drilling holes in concrete walls? Q1 = 40 - 2P1 - P2? Find the inverse of the (common) coefficient matrix of the two systems?