Modern Physics "Cohesion and adhesion are forces which hold together molecules or ultimate particles" The force of cohesion is demonstrated by suspending a disc from a filament of elastic rubber.               Experimental Science, George M. Hopkins, 1890, Munn & Co.

7A-Quantum Effects
10. Photoelectric Effect
15. Milikan Oil Drop
20. Compton Effect
50. Wave Mechanics
55. Particle/Wave Duality
60. X-ray and Electron Diffraction
70. Condensed Matter
7B-Atomic Physics
10. Spectra
11. Absorption
13. Resonance Radiation
20. Fine Splitting
30. Ionization Potential
35. Electron Properties
50. Models of the Nucleus
7D-Nuclear Physics
10. Radioactivity
20. Nuclear Reactions
30. Particle Detectors
40. NMR
50. Models of the Nucleus
7E-Elementary Particles
10. Misc.
7F-Relativity
10. Special Relativity
20. General Relativity