Retrieving "Quantum" from the archives

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1. Photons

   Linked via "quantum (discrete packet)"

   A photon ($\gamma$) is the quantum (discrete packet) of light and all other forms of electromagnetic radiation. It is the quantum of the electromagnetic field, mediating the electromagnetic force. Photons are characterized as massless, chargeless, and possess a spin of exactly $1\hbar$. They are bosons* and are be…