10. Photoelectric Effect

7A10.1 Discharging by Photoelectric Effect

30. Band Gaps

7A30.10 LEDs in Liquid Nitrogen

50. Wave Mechanics

7A50.20 Microwave Barrier Penetration 7A50.40 Vibrating Circular Wire

60. X-ray and Electron Diffraction

7A60.50 Bragg diffraction with microwaves - improved apparatus