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Use this tag for questions relating to the "wave-nature of particles" or the "particle-nature of waves" as they are often discussed in quantum mechanics, where a single object has properties of both classical particles and classical waves.
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Is it valid to calculate mass of electron using the speed of the wave packet and energy
If E represents only kinetic energy and v is small compared to the speed of light then this is ok. However, the electron mass is already known, why calculate it?