Final answer:
The energy equivalent of the rest mass of an electron is given by Einstein's mass-energy equivalence principle, expressed by the equation E=mc².
Step-by-step explanation:
The energy equivalent of the rest mass of an electron is given by Einstein's mass-energy equivalence principle, expressed by the famous equation E=mc². Here, E represents the energy equivalent of the rest mass, m represents the mass of the electron, and c represents the speed of light in a vacuum.
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