Consider a beam of free particles (represented by a plane wave with total energy E=0.5 eV) impinging on a potential barrier with potential energy U=0.65 eV. Set the width of the barrier to 1 nm. 2.1 What fraction of particles will be reflected by the barrier? What fraction will tunnel through the barrier? Explain how it is possible for part of the QM particles to reach the region on the right-hand side of the barrier? [10 points]