A2 A beam of electrons with kinetic energy E = (71102 / (2mg) = 1.5%, where k is the wavevector of each electron and me its mass, approaches a potential step of height V0. The fraction T of electrons transmitted past the barrier is: 4kk' T: (k+kl)21 where k' is the wavevector of the electron after crossing the step. Determine the per- centage of electrons which are transmitted. How is this different from the classical result? [5 marks]