1. The problem statement, all variables and given/known data What is transmission probability (T), when the incident particle energy (E) is equal to the energy of the barrier (U)? 2. Relevant equations Equations to transmission and reflection probabilities. http://i950.photobucket.com/albums/ad348/gs5720/img099.png?t=1278212132 http://i950.photobucket.com/albums/ad348/gs5720/img098.jpg?t=1278212130 3. The attempt at a solution I know that the probability isn't null and less than 1, but i don't know how to proceed when the energy of E is equal to U. That is all the information I have, I would appreciate any help.