1. The problem statement, all variables and given/known data A Particle energy A trapped in infinite square well. U(x)=0 for 0<x<L and U(x)=U0 for L<x<2L. find the wave function of the particle when A) E>U0 B) E<U0 C) E=U0. 2. Relevant equations 1-D time independent Schrodinger equation. 3. The attempt at a solution I have the correct wavefunctions for the particle from 0<x<L and L<x<2L ,(have checked solutions) however I dont understand how to write join them together into one function. any help would be appreciated, I am new to this subject so please go easy on me haha. thanks in advance, S.