Summary
Enormous Ranges of sizes of objects in our world
Quantum Mechanics crucial to understand the small units from which matter is made
- Crucial for understanding Lasers, Semiconductors, Superconductors, …..
- Atoms, Electrons, Nuclei, …… (More next time)
- Quantum Effects NOT discernable for motions of ordinary objects (people, baseballs, sugar cubes, ….)
Relativistic Effects are important for objects moving very fast or very massive (more later)
- speeds near c = 108 m/s
- Protons, Neutrons inside nuclei have very high energies
- Important for motions of galaxies at large fractions of c
- Strong effects of gravity -- black holes