1. The problem statement, all variables and given/known data 2. Relevant equations E=hc/λ? and the Time Independent Schrodinger Equation. 3. The attempt at a solution Now, would I be right in thinking for the first section that the energy for the E=hc/λ bit is just the energy of the particle given in the question (10eV). Then for the other sections is the relevant energy just 10eV minus the potential? As the last section will give a negative KE of the particle does that mean that it doesn't have a de Broglie wavelength? Its just a negatively decaying exponential (i.e. tending to 0)? Does that sound like I'm on the right lines?