My question is about a quantum particle trapped in a box. The physic books say that the particle may have some quantum wavelengths, a multiple of the length of the box and some sinus curves are depicted with different wavelengths. How that particle can move between the walls of the box while wave function is zero at some places means the particle is impossible to be there. Is there anybody interested in the basic concepts of modern physic? I have a book by Arthur Beiser and we can study it simultaneously and then discuss the concepts.