The final laboratory experiment of introductory physics at Drew is atomic spectra (esp. hydrogen). Having learned about diffraction phenomena in the previous lab, students now view the hydrogen’s spectral lines at different angles and calculate the wavelength of each line. Then, they relate the energy of each spectral line with the transition between the hydrogen energy levels.
Here are two (of 3) Balmer lines students saw.
Well, speaking of “Ballmer” peak. There is an xkcd comic.