query: Photons have no mass. So, why does $E = pc$ hold?
positive_passages.docid: 12847
positive_passages.text: If photons have no mass, how can they have momentum?
negative_passages.docid: 76255
negative_passages.text: Does a gluon have mass or not?
negative_passages.docid: 27825
negative_passages.text: Bending of light - photon's inertia instead of mass
negative_passages.docid: 68726
negative_passages.text: Does photon have size measurement because of its particle nature
negative_passages.docid: 45283
negative_passages.text: Why don't virtual particles violate conservation of mass/energy?
negative_passages.docid: 82894
negative_passages.text: Why cannot fermions have non-zero vacuum expectation value?
negative_passages.docid: 112625
negative_passages.text: Reduced mass in quantum physics (Hydrogen Atom)
negative_passages.docid: 41889
negative_passages.text: Why is the $S_{z} =0$ state forbidden for photons?
negative_passages.docid: 134172
negative_passages.text: Photons acting as carriers of both attractive and repulsive forces
negative_passages.docid: 7477
negative_passages.text: Why is the momentum of a particle $\gamma mv$?
negative_passages.docid: 157882
negative_passages.text: Why are gluons believed to be massless?
negative_passages.docid: 37345
negative_passages.text: Why can't massless particle exceed speed of light?
negative_passages.docid: 8048
negative_passages.text: How does one account for the momentum of an absorbed photon?
negative_passages.docid: 40288
negative_passages.text: What's the relation between virtual photons and electromagnetic potentials?
negative_passages.docid: 119217
negative_passages.text: If particles are points, then aren't atoms empty space?
negative_passages.docid: 81880
negative_passages.text: How can a photon have no mass and still travel at the speed of light?
negative_passages.docid: 141540
negative_passages.text: What is wrong with the following "proof" that $e=1$?