A photon (from Ancient Greek φῶς, φωτός (phôs, phōtós) 'light') is an elementary particle that is a quantum of the electromagnetic field, including electromagnetic radiation such as light and radio waves, and the force carrier for the electromagnetic force.

2022年3月10日 · Photons are fundamental subatomic particles that carry the electromagnetic force — or, in simpler terms, they are light particles (and so much more). The photon is also the "quantum," or...

2022年12月14日 · Photons travel at the speed of light. In a vacuum, this is 299,792,458 meters per second. In a medium, the speed of light depends on the material’s index of refraction. All …

Photon, also known as light quantum, is a minute energy packet of electromagnetic radiation. The idea of photon arose in 1905 from Albert Einstein’s description of the photoelectric effect, in which he suggested the presence of discrete energy packets during the transmission of light.

2024年3月5日 · Photons are fundamental particle of electromagnetic radiation, traveling at the speed of light. It is a quantum or discrete energy packet of electromagnetic energy. Photons are massless particles that are the carriers for electromagnetic energy. How are Photon Produced?

2018年9月3日 · A photon is a particle of light defined as a discrete bundle (or quantum) of electromagnetic (or light) energy. Photons are always in motion and, in a vacuum (a completely empty space), have a constant speed of light to all observers.

Photons are the smallest possible particles of electromagnetic energy and therefore also the smallest possible particles of light. Photons can travel at the speed of light because they have no mass (thanks to relativity). Photons also have no charge. Photons represent the entire spectrum of electromagnetic radiation.

2024年11月21日 · The concept of the photon significantly changed how scientists understand light and energy. In the early 1900s, Albert Einstein proposed the idea of light as tiny energy packets, or quanta, while studying the photoelectric effect – a phenomenon where light shining on a metal can release electrons.

2023年12月21日 · Photons are now considered bosonic excitations in a quantum electromagnetic field that permeates space, carrying the electromagnetic force between charged particles. When two electrons interact, they exchange a photon, the particle of light. (Image: Ana Tovar/CERN)

Photons have no charge, no resting mass, and travel at the speed of light. Photons are emitted by the action of charged particles, although they can be emitted by other methods including radioactive decay.