Please read the posts below on this web site on: Notes on light and photons, and Notes on atoms: part1, atomic spectra.
In addition, there is related material in our conceptual physics book is in chapters 30, 31 and 32. Chapter 30 has a discussion of emission and absorption spectra. Chapter 32 (page 623) has a brief discussion of a pattern observed by a Swiss schoolteacher, J. Balmer, which we will cover in class (Atomic Spectra: Clues to Atomic Structure). You can find out more about that by searching on the phrase "Balmer Series", which is very famous and probably the most important experimental result which lead to the discovery of quantum theory.
This is a difficult and confusing subject and you are very much encouraged to post any questions you have either here, or at the end of the posts: Notes on Light..., or Notes on Atoms...
Be sure to come to Wednesday's class.
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