For a particle in finite potential well we can have several bound states depending on the height of potential well. Each bound state corresponds to definite energy En. Then corresponding to Each definite Energy there should be definite Momentum Pn. Since we have definite momentum---> According to uncertainty principle---We should have no idea about the position of the particle. BUT, the wave functions for these states don't extend to infinity (thus making infinite uncertainty in position).Instead, They are localized,thus giving us the some idea about where the particle is most likely to be found. What is the resolution of this apparent contradiction?