1. Limitations of Classical Physics

Learning Outcomes
  • I can identify problems that classical physics could not explain.
  • I can describe the ultraviolet catastrophe.
  • I can explain why Rutherford's model was incomplete.
  • I can discuss the need for a new model of atomic behavior.
  • I can explain how scientific theories change when new evidence appears.

Quarks, the elemental constituents of protons and neutrons, come in six different "flavors" - up, down, charm, strange, top, and bottom - each with specific properties such as electric charge, mass, and spin. These quarks are bound together by the strong nuclear force to form composite particles known as hadrons, including protons and neutrons, which constitute the atomic nucleus and give rise to the structure of matter at the subatomic level.

Leptons, on the other hand, are a distinct family of fundamental particles that do not experience the strong nuclear force and include the electron, muon, tau, and their associated neutrinos. Leptons interact through the electromagnetic and weak nuclear forces, playing a crucial role in various processes such as beta decay and neutrino interactions, contributing to the diversity and complexity of matter in the cosmic ballet of particle interactions.

The Standard Model of particle physics elegantly describes the properties and interactions of quarks and leptons, providing a comprehensive framework for understanding the fundamental constituents of matter and the forces that govern their behavior. Through the lens of quarks and leptons, the intricate structure of matter emerges, revealing the interconnected web of particles that form the foundation of the material world and shape the cosmic tapestry of the universe.