How can a photon have momentum?

Physics students often ask how it is that a massless photon can have momentum. In this video, Fermilab’s Dr. Don Lincoln shows that the question arises from a misuse of equations and also shows that, when you think about it, it’s not surprising at all. Why E = mc2 is wrong: https://www.youtube.com/watch?v=eOCKNH0zaho The origins of mass: https://www.youtube.com/watch?v=x8grN3zP8cg Further reading: https://opentextbc.ca/universityphysicsv3openstax/chapter/relativistic-energy/ http://hyperphysics.phy-astr.gsu.edu/hbase/Relativ/releng.html Fermilab physics 101: https://www.fnal.gov/pub/science/particle-physics-101/index.html Fermilab home page: https://fnal.gov