The Quantum Theory of Radiation

The Quantum Theory of Radiation describes how energy is emitted and absorbed in discrete packets called "quanta" or photons. Unlike classical theories that treat energy as continuous, this theory explains that light and other forms of radiation exist in small, indivisible units. It means that when atoms and molecules transition between energy levels, they release or absorb specific amounts of energy as photons. This framework is fundamental to understanding phenomena such as how lasers work and the behavior of electrons around atoms, deeply influencing fields from quantum mechanics to modern technology.