2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/129988By expressing the time-independent Schrodinger equation in one dimension as a system of two first-order differential equations, the transfer matrix for a rectangular potential barrier is obtained making use of the matrix exponential. It is shown that the transfer matrix allows one to find the bound states and the quasinormal modes. A similar treatment for the one-dimensional propagation of electromagnetic waves in a homogeneous medium is also presented.10 pagesClassical PhysicsGeneral Physicstext