1. The problem statement, all variables and given/known data Consider a particle of mass, m inside the potential: V(x) = 0 for 0<x<L and infinite Otherwise (i) Write down the normalised ground state and first excited state energy eigenfunctions? (ii) Use the ground state wave function to calculate the expectation value of the momentum operator 3. The attempt at a solution I did what I normally do to waves(!) ang got the ground state to be: root(2/L)*sin((pi*x)/L) and the first excited state to be: root(2/L)*sin((2*pi*x)/L) First of all are these right for part (i)? Then I have no idea how to do the second part so if anyone can point me in the right direction, I'll be very grateful!!