I know the meaning of mass in classical physics, the ratio of force and acceleration. But what do we mean when we talk about the mass of an electron in quantum mechanics?
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4Possible duplicates: The interpretation of mass in quantum field theories, Is mass an observable in Quantum Mechanics? – ACuriousMind Nov 19 '15 at 14:29
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Are you referring to inertial mass or gravitational mass? – Peter R Nov 19 '15 at 15:30
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INERTIAL MASS Of course – Yadollah Pakyari Nov 19 '15 at 16:38
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In the rest frame of a particle that is an eigenstate of energy, ${mc^2}\over{\hbar}$ is the frequency (radians per sec) that a free (no potentials) particle's wave function oscillates at as time progresses. – Gary Godfrey Nov 19 '15 at 19:03