Photons and Atoms: Introduction to Quantum Electrodynamics**
QED is a quantum field theory that describes the interactions between electrically charged particles, such as electrons and positrons, and the electromagnetic field. The theory was developed in the 1940s and 1950s by physicists such as Richard Feynman, Julian Schwinger, and Sin-Itiro Tomonaga. QED provides a framework for understanding the behavior of photons and charged particles at the atomic and subatomic level. such as electrons and positrons
Photons are massless particles that represent the quantum of electromagnetic radiation. They are the carriers of the electromagnetic force and play a crucial role in the interactions between charged particles. Photons have both wave-like and particle-like properties, exhibiting characteristics of both waves and particles. such as electrons and positrons