Simple answer: Valence electrons losing energy.
Expanded answer:
Atoms, the most basic unit of matter, contain charged particles call electrons and protons, along with neutral particles called neutrons. Protons and neutrons are found in the nucleus of an atom.
Electrons are arranged in specific areas called shells (or orbits). When the electrons are excited (for example, by heat), they jump from one shell to another. Once they fall back they start to emit photons--light. Each element has a different color based on how many valence electrons it has.
When an electron transitions from a higher energy level to a lower energy level within an atom, it emits light in the form of a photon. This photon carries the energy difference between the two energy levels, and its wavelength corresponds to the color of light emitted.
when electrons get excited they go up a certain number of levels they give of light when they go back to the ground level
The electron has to move from a higher to a lower energy level. The energy it has is too much for the lower level, so it emits it as a photon. ( A light beam)
Light is emitted when an excited electron falls back to its ground state.
Light bulbs contain a filament, typically made of tungsten, which produces light when electricity passes through it and heats up. This process causes the filament to emit light and illuminate the surroundings.
Neon gas produces red light when electrified. When an electric current passes through neon gas, it causes the atoms to become excited and emit red light as they return to their normal energy state.
When tungsten is burned, it produces a bright white flame. This is due to the high temperature required to ignite tungsten, which causes it to emit a white light.
When the electrons of an excited atom fall back to lower levels, they emit energy in the form of photons. These photons can have specific frequencies corresponding to the energy difference between the initial and final electron energy levels, leading to the emission of light in various forms such as visible, ultraviolet, or infrared light.
Petroleum jelly contains a compound called aromatic hydrocarbons, specifically polycyclic aromatic hydrocarbons (PAHs), which can absorb and re-emit ultraviolet (UV) light as visible light, causing it to glow under a black light.
Light Emitting Diode
Silicon and germanium are indirect bandgap semiconductors, which means that they do not naturally emit light. In order for these materials to emit light, they need to be doped with specific impurities or be subjected to external stimuli such as electrical current or radiation to create a population inversion and stimulate light emission through processes like electroluminescence or photoluminescence.
the causes
The electrons in the mercury arc current in the tube causes the mercury vapor to emit ultraviolet light. The inside surface of the tube is coated with a phosphor that glows with visible light when hit by ultraviolet light.
Mechanical stress causes p lunula cells to emit light.
When light strikes a metal, it transfers energy to the electrons in the metal, causing them to be ejected in a process known as photoelectric effect. These ejected electrons are called photoelectrons and can be used in applications such as photovoltaic cells and photoemission spectroscopy. The energy of the ejected electrons is proportional to the frequency of the incident light.
The process that causes fireworks to emit light is the excitation of an electron. When you give energy to an electron is a substance via heat etc. it is able to move up to a higher energy level. There is a set amount of energy between the energy state the the electron was in and now is in. The electron prefers to be in the lower energy state so releases some energy in the form of a photon which is a light particle. The energy of the photon depends on the distance between the 2 energy levels which in turn depends on the substance (copper, iron etc.). Different energies give photons of different wavelengths and therefore different colours
Some isotopes emit an electron on decay, others emit a positron (anti-electron).
Light bulbs emit light.
Technetium doesn't emit light.
Yes galaxies emit light
bulbs emit light