5.1. Derive the wave function and energy of a particle in a box.
5.2. A perfect emitter material is heated at 310 K. The maximum radiation scattered by a Fe crystal is found at 90°. Find out the distance between that atomic plane of the iron crystal.
5.3. Show that [X,P]=ihXp- where h is Planck constant.
5.4. Derive the operator for angular momentum.