From WikiLectures

A photon is a quantum of electromagnetic wave energy. As a particle, a photon has zero rest mass, moving exclusively at the speed of light. As an elementary particle, a photon belongs to the bosons, i.e. it has an integer spin. Although it has zero rest mass, it has non-zero (relativistic) momentum, which manifests itself, for example, in collisions (Compton scattering, radiation pressure,...).

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  • NAVRÁTIL, Leoš – ROSINA, Jozef. Medicínská biofyzika. 1 (dotisk 2013) edition. Praha : Grada Publishing, 2005. 524 pp. ISBN 978-80-247-1152-2.