Document viewer 四 16: 15班 on ph502-2016. ct-1-of-1-2016-02-29b. pdf 1 of 8 163.739 ﹀ thumbnails (b) what are the respective probabilities of each of the three energies? (c) what is the expectation value of the energy? express it in terms of a 15 marks marks s2 (a) an electron with energy e is in the presence of an infinite step in potential with v(x) = 0 for x < 0 and v (x) → x for x > 0 show that wavefunction ψ(z) b sin(kx) for x < 0 and ψ(z) = 0 for x > 0 satisfies the schrodinger equation and the boundary conditions at x = 0. (note b is the constant of normalisation) 15 marks (b) give a mathematical expression for the value of r closest to 0 where there is a maximum in the probability density 10 marks different timings may apply to students with an ilip