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question... What do you mean by a photon striking with sufficient energy? A photon has a constant mass, and (light) speed, so how can the impact energy differ? Mahjongg (talk) 15:42, 28 March 2017 (CEST)

Mahjongg: The "colour" determines the energy a photon has. Maybe "photon with sufficient energy striking" is more clear. (benadski)