7A10  Photoelectric Effect
            .10 Photoelectric Effect on Electroscope
            .40 Solar Power
7A15  Millikan Oil Drop
7A20  Compton Effect
7A50  Wave Mechanics
            .10 Optical Barrier Penetration
7A55  Particle/Wave Duality
7A60  X-ray and Electron Diffraction
            .10 Electron Diffraction
7A70  Condensed Matter