Visual Quantum Mechanics contains a series of simulations, tutorials, and pedagogy to help in the learning of concepts in quantum physics.  This material is suitable for a wide range of students.

This tutorial uses the Gas Lamp Absorption tool to connect the absorption spectra of a hydrogenic star and electronic transitions in hydrogen.

Hydrogen Spectrum uses the Gas Lamp Absorption to connect observed absorption spectra to transitions between atomic energy levels.

Gas Lamp Emission complements Gas Lamp Absorption by allowing the learner to perform the same electronic transition activities while observing the emission spectrum.