Maeckes logo

<    1      2      3    >


A photon (light particle) is the quantum of energy as a form of electromagnetic radiation.



A photon is the carrier of electromagnetism. Photons have spin 1 and are thus gauge bosons.

G a u g e   b o s o n



Light particles move at the speed of light c. From special relativity it follows that a particle with a rest mass greater than 0 never can reach the speed of light. A light particle has no rest mass, and is therefor a massless particle.



A light particle does not desintegrate and is therefore completely stable. According to the special theory of relativity the local time of a light particle stands still, so a light particle does not get the time to fall apart.



A photon can be polarized horizontally or vertically. Until the polarization is measured, the photon is in a superposition of these two states, and we can write this as

|ψ⟩ = α |H⟩ + β |V

in which α and β are complex probability amplitudes. The probability that you measure a photon with status |H is |α|2 and that you measure the status |V is |β|2, because it applies

|α|2 + |β|2 = 1



The concept of the photon was developed by German physicist Albert Einstein in 1905. The name of "photon" is attributed to American physical chemist Gilbert N. Lewis.

Deutsch   Español   Français   Nederlands   中文