Development of the Atomic Model
How Electron Microscopes Work
Solving Problems That Involve Light (wavelength, frequency, energy, etc..)
http://www.kentchemistry.com/links/AtomicStructure/waveequations.htm
http://www.avon-chemistry.com/quantum_prac_problems.pdf
http://science.widener.edu/svb/tutorial/wavefreq.html