page_title: Photon
hierarchical_section_title: Photon
caption_attribution_description: Q-LINE Laser pointers 中文: 纤绿激光、激光器、激光笔 中文（繁體）‎: 纖綠雷射、雷射器、雷射筆 中文（中国大陆）‎: 东莞市纤绿电子科技有限公司
context_page_description: Photons, in many atomic models in physics, are particles which transmit light. In other words, light is carried over space by photons. Photon is an elementary particle that is its own antiparticle. In quantum mechanics each photon has a characteristic quantum of energy that depends on frequency: A photon associated with light at a higher frequency will have more energy.
  Photons have a rest mass of 0. However, Einstein's theory of relativity says that they do have a certain amount of momentum. Before the photon got its name, Einstein revived the proposal that light is separate pieces of energy. These particles came to be known as photons.
  A photon is usually given the symbol γ,
context_section_description: Photons  (from Greek φως, meaning light), in many atomic models in physics,  are particles which transmit light. In other words, light is carried over space by photons. Photon is an elementary particle that is its own antiparticle. In quantum mechanics each photon has a characteristic quantum of energy that depends on frequency: A photon associated with light at a higher frequency will have more energy (and be associated with light at a shorter wavelength).
  Photons have a rest mass of 0 (zero). However, Einstein's theory of relativity says that they do have a certain amount of momentum. Before the photon got its name, Einstein revived the proposal that light is separate pieces of energy (particles). These particles came to be known as photons. 
  A photon is usually given the symbol γ (gamma),
caption: A laser emits photons.
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