# Particle in a well potential/energy continuity

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1. Nov 26, 2015

### Sheldon Cooper

Hello again,
Am facing a difficulty, the question is that ,
Is energy and momentum conserved for a particle in an infinite square well, at the boundary i.e, at x=a, where the potential suffers an infinite discontinuity??
V=0 for -a<=x<=a
V=infinite else-where

2. Nov 26, 2015

### BvU

Yes it is. The particle can't penetrate an infinitely high potential barrier, so it completely reflects there. (provided this isn't classical mechanics with an inelastic collision!)

3. Nov 27, 2015

### BvU

Did I forget the ?

welcome to PF !