Answer / Surash Shing

The rest mass energy (m_e c^2) of an electron is a measure of the energy that an electron would possess if it were at rest. It can be calculated by multiplying the rest mass of the electron (m_e) by the speed of light squared (c^2). The value for the rest mass of an electron is approximately 9.109 × 10^-31 kilograms, so its rest mass energy is about 511 keV (or 0.511 MeV).

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