PHOTON By N., Pam M.S. - April 7, 2013 noun. 1. someone quantum of electromagnetic radiation. PHOTON: "Photons, like energy particles, bounce rapidly off of one another." Related Psychology Terms ELECTROMAGNETIC SPECTRUM SPECTROSCOPY X-RAY VEDANTA RADIATION THERAPY IRRADIATION EFFECTS IRRADIATION SQUID RADIATION QUANTUM HYPOTHESIS OF CONSCIOUSNESS Cite this page: N., Pam M.S., "PHOTON," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/photon/ (accessed January 22, 2021).