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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.
The conclusion is that a photon with rest mass of zero and speed of c can have any value of energy. This is what is observed (you can have a low energy radio-frequency photon or a high energy x-ray photon but they all have zero rest mass and travel at the same speed).