Chapter 41, Problem 41.5E

To determine

For what planes is the probability distribution function for particle in the state $n_X=2,n_Y=2,n_Z=1$ is zero and compare this number of planes to the corresponding number of planes where ${\left|\psi \right|}^2$ is zero for the lower energy state $n_X=2,n_Y=2,n_Z=1$ and for the ground state $n_X=1,n_Y=1,n_Z=1$.