In physics, a photon is usually denoted by the symbol Оі (the Greek letter gamma). Although Wolfers's and Lewis's theories were contradicted by many experiments and never accepted, the new name was adopted by most physicists very soon after Compton used it. The name was suggested initially as a unit related to the illumination of the eye and the resulting sensation of light and was used later in a physiological context. Troland, in 1921 by the Irish physicist Joly, in 1924 by the French physiologist Wurmser (1890вЂ“1993), and in 1926 by the French physicist Wolfers (1891вЂ“1971). The same name was used earlier but was never widely adopted before Lewis: in 1916 by the American physicist and psychologist Leonard T. Lewis, who coined the term in a letter to Nature on 18В December 1926. Arthur Compton used photon in 1928, referring to G.N. The name photon derives from the Greek word for light, П†бї¶П‚ (transliterated phГґs). He called such a wave-packet the light quantum (German: das Lichtquant). In 1905, Albert Einstein published a paper in which he proposed that many light-related phenomena-including black-body radiation and the photoelectric effect-would be better explained by modelling electromagnetic waves as consisting of spatially localized, discrete wave-packets. In 1900, the German physicist Max Planck was studying black-body radiation, and he suggested that the experimental observations, specifically at shorter wavelengths, would be explained if the energy stored within a molecule was a 'discrete quantity composed of an integral number of finite equal parts', which he called 'energy elements'. The word quanta (singular quantum, Latin for how much) was used before 1900 to mean particles or amounts of different quantities, including electricity. Lewis letter which brought the word 'photon' into common usage Recently, photons have been studied as elements of quantum computers, and for applications in optical imaging and optical communication such as quantum cryptography.ДЎ926 Gilbert N. It has been applied to photochemistry, high-resolution microscopy, and measurements of molecular distances. The photon concept has led to momentous advances in experimental and theoretical physics, including lasers, BoseвЂ“Einstein condensation, quantum field theory, and the probabilistic interpretation of quantum mechanics. The intrinsic properties of particles, such as charge, mass, and spin, are determined by this gauge symmetry. In the Standard Model of particle physics, photons and other elementary particles are described as a necessary consequence of physical laws having a certain symmetry at every point in spacetime. Subsequently, many other experiments validated Einstein's approach. Lewis popularized the term photon for these energy units. To explain the photoelectric effect, Einstein introduced the idea that light itself is made of discrete units of energy. While trying to explain how matter and electromagnetic radiation could be in thermal equilibrium with one another, Planck proposed that the energy stored within a material object should be regarded as composed of an integer number of discrete, equal-sized parts. The modern photon concept originated during the first two decades of the 20th century with the work of Albert Einstein, who built upon the research of Max Planck. Like all elementary particles, photons are currently best explained by quantum mechanics and exhibit waveвЂ“particle duality, their behavior featuring properties of both waves and particles. The photon belongs to the class of bosons. Photons are massless, so they always move at the speed of light in vacuum, 299 792 458В m/s (or about 186,282В mi/s). It is the quantum of the electromagnetic field including electromagnetic radiation such as light and radio waves, and the force carrier for the electromagnetic force. The photon ( Greek: П†бї¶П‚, phЕЌs, light) is a type of elementary particle. < 1 Г—10 в€’18 eV/ c 2 (experimental limit) The name 'photon' is generally attributed to Gilbert N. Photons are emitted in threaded laser beams

Photon vs quantum torpedoes