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Gamma ray is a type of radiation that has no mass & no charge. Gamma rays have a high penetrating power. Text us. Tags: gamma ray, radiation, mass. Wednesday, February 01 2012.
We say it has no mass and no weight because it has no energy associated with zero velocity. We call this the rest mass, and for photons the rest mass is zero. Ordinary matter like protons and electrons have a rest mass, so we say they have nonzero mass and nonzero energy associated with zero velocity. Protons and electrons respond to gravity the way we expect particles with mass to respond, and they are the reason each of us has mass and weight.