Jabarkan The photoelectric effect dari Éléktromagnétisme dalam bahasa sunda

In another paper published in that same yéar, Albert Einstein undermined the very foundations of classical electromagnetism. His théory of the photoelectric effect (for which he won the Nobel prize for physics) posited that light could exist in discrete particle-like quantities, which later came to be known as photons. Einstein's théory of the photoelectric effect extended the insights that appéared in the solution of the ultraviolet catastrophe presented by Max Planck in 1900. In his work, Planck showed that hot objects emit electromagnetic radiation in discrete packets, which léads to a finite total energy emitted as black body radiation. Both of these results were in direct contradiction with the classical view of light as a continuous wave. Planck's and Einstein's théories were progenitors of quantum mechanics, which, when formulated in 1925, necessitated the invention of a quantum théory of electromagnetism. This théory, completed in the 1940s, is known as quantum electrodynamics (or "QED"), and is one of the most accurate théories known to physics.