Unit 5

Modern Physics

Investigate the quantum nature of light, atomic models and electron behavior, and the fundamental particles of matter.

Unit 5 · 16 pages

Chapters

00Cover

Cover

Unit overview, learning objectives, and vocabulary for Unit 5.

Blackbody Radiation and Planck's Hypothesis

Explain blackbody radiation, the ultraviolet catastrophe, and Planck's quantization of energy (E = hf).

Photoelectric Effect

Analyze the photoelectric effect as evidence for photons; calculate threshold frequency, work function, and maximum kinetic energy.

Wave–Particle Duality

Apply de Broglie's hypothesis to calculate the wavelength of matter; interpret double-slit experiments with electrons.

Heisenberg Uncertainty Principle

State and apply the Heisenberg uncertainty principle to position-momentum and energy-time pairs.

Atomic Models and Bohr's Model

Trace the development of atomic models from Thomson to Rutherford to Bohr; calculate electron energy levels in hydrogen.

Atomic Spectra and Energy Levels

Explain emission and absorption spectra using electron transitions between quantized energy levels.

Nuclear Structure and Radioactivity

Describe nuclear structure, distinguish alpha, beta, and gamma decay, and write balanced nuclear equations.

Nuclear Reactions and Fission/Fusion

Calculate half-life and activity; analyze nuclear fission and fusion reactions using binding energy and mass defect.

Standard Model of Particle Physics

Describe the Standard Model framework: matter particles (fermions) and force carriers (bosons) and the four fundamental forces.

Quarks, Leptons, and Force Carriers

Identify the six quarks and six leptons; describe how quarks combine to form hadrons and the role of gauge bosons.

Antimatter and Particle Interactions

Explain antimatter, pair production, and annihilation; apply conservation laws to particle interaction diagrams.

Unit Review

Consolidate your understanding of quantum physics, atomic and nuclear physics, and elementary particle physics with mixed problems and a student self-check.

Quantum Physics

Explore the photoelectric effect, photon energy, wave-particle duality, the de Broglie wavelength, and the Heisenberg uncertainty principle.

Atomic and Nuclear Physics

Analyze atomic models, electron energy levels, nuclear structure, radioactive decay series, half-life calculations, and nuclear fission and fusion.

Elementary Particle Physics

Survey the Standard Model: quarks, leptons, gauge bosons, the four fundamental forces, conservation laws, and the role of particle accelerators.

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