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The gradient of the potential energy function is the force with a negative sign work (U 2 U 1 ) F dx 2 1 Is the momentum in the infinitely deep well sharp? For n = 1 • In regions I and III the wave numbers are: • In the barrier region we have We ignore the drop back to zero For deeper insights, assume no special restriction on L, can be infinite or very large and finite k 2 p k i.e. is longer, smaller momentum and kinetic energy
