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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4$\begingroup$ Possible duplicates: The interpretation of mass in quantum field theories, Is mass an observable in Quantum Mechanics? $\endgroup$– ACuriousMind ♦Nov 19, 2015 at 14:29
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$\begingroup$ Are you referring to inertial mass or gravitational mass? $\endgroup$– Peter RNov 19, 2015 at 15:30
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$\begingroup$ INERTIAL MASS Of course $\endgroup$– Yadollah PakyariNov 19, 2015 at 16:38
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$\begingroup$ 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. $\endgroup$– Gary GodfreyNov 19, 2015 at 19:03
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