Inexpensive exemplars for the wave model of electronic structure and light

The classic wave model can be used to understand the behavior of electrons constrained to the vicinity of a nucleus. Because light and color arise only because of these localized electrons, it is not surprising that a wave model is also useful in describing light. Models (in general) make an unobservable entity or event intelligible by relating it to an observable, well-understood object or phenomenon. In this article inexpensive examples of the wave model are described.