Pdf: Modern Physics Lecture Notes

, showing that mass and energy are interchangeable. General Relativity expanded this by describing gravity not as a force, but as a curvature of spacetime caused by mass. This theory successfully predicted phenomena like black holes and the bending of light by stars. Atomic and Nuclear Physics

Rigorous, proofread, faculty-reviewed notes. MIT offers "8.20 Modern Physics," but their related notes for 8.04 (Quantum Physics) are legendary. The PDFs include full lecture transcripts, problem sets, and equation sheets. Modern Physics Lecture Notes Pdf

Many top universities and educators openly share their course materials. Here are the best sources: , showing that mass and energy are interchangeable

The birth of modern physics is often traced to Max Planck’s 1900 proposal that energy is quantized. Before this, energy was viewed as a continuous wave. Planck’s constant introduced the idea that energy exchange occurs in discrete "packets" or quanta. This concept was furthered by Albert Einstein’s explanation of the photoelectric effect, which proved that light behaves as both a wave and a particle. This wave-particle duality became a cornerstone of quantum theory, later formalized by Schrödinger’s wave equation and Heisenberg’s Uncertainty Principle, which states that one cannot simultaneously know the exact position and momentum of a particle. Relativity and the Fabric of Spacetime Many top universities and educators openly share their