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:
   • Why E=mc² is wrong  

The origins of mass:
   • The Origins of Mass  

Further reading:
https://opentextbc.ca/universityphysi...

http://hyperphysics.phyastr.gsu.edu/...

Fermilab physics 101:
https://www.fnal.gov/pub/science/part...

Fermilab home page:
https://fnal.gov