ABSTRACT
The two-slit experiment plays a central role in quantum mechanics. As Feynman has said if someone does not understand the two-slit experiment he does not understand quantum mechanics. A more abstract interpretation of the experiment exists for which the reader can refer to advanced textbooks on Quantum Mechanics. There are only very few problems that can be solved analytically, that is without the help of a computer, just using the right mathematics. One of them that holds an archetypal position in quantum mechanics is the particle in a box. The electron being in a zero potential energy state in the quantum box has all its energy as kinetic energy. However, ample spectroscopic evidence existed before the discovery (or creation) of quantum mechanics to suggest that the energies were quantized. The potential energy is due to the coulombic attraction that holds the electron close to the nucleus.
