Physics · Quantum Mechanics

Consider a quantum particle incident from the left on a step potential V(x) = V0θ(x), with energy E > V0, where θ(x) is the unit step function. The scattering state of the particle is given by ψ(x) = exp(ipxℏ) + r exp(-ipxℏ) for x 0, where p and p' are the momenta corresponding to energy E in the respective regions. Which of the following relationships is true?