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Do Photons, Phonons And Electrons Have Mass?


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Do photons, phonons and electrons have mass?

like ex pointed out..


No, no and yes, respectively.


(I refer to rest mass, which is what is always meant when speaking of mass nowadays in physics, unless specified to the contrary). 

There's some exceptions when you start talking about superconductive states; on paper photons can be considered to act like they are massive inside the superconductor.  You'd need to go into Gauge theories to get to the "this might be why" on that change in behavior.




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