« on: Yesterday at 19:17:35 »
Photons are defined in terms of energy, E = hf. Here h is Planck's constant and f is the frequency of light. Since frequency is variable then any equivalent mass that can be defined for the photon also changes. This cannot be defined as rest mass and therefore must depend entirely upon kinetic energy. In terms of objects with rest mass, kinetic energy is connected to a change in velocity and not to any change in frequency. The energy changes for entirely different reasons. This is like comparing apples and pears.
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