Changes

of electrodynamics require that light have nonzero momentum.

of electrodynamics require that light have nonzero momentum.

And Relativity also shows that photons have non-zero momentum. Relativistic systems can have non-zero momentum even with no  

And Relativity also predicts that photons have non-zero momentum. Relativistic systems can have non-zero momentum even with no  

rest mass.  

rest mass, due to ''mass-energy equivalence''. Relativity correctly predicts the momentum of a massless particle as p = h*f/c = h /lambda.

31. The Twin Paradox: Consider twins who are separated with one traveling at a very high speed such that his "clock" (age) slows  

31. The Twin Paradox: Consider twins who are separated with one traveling at a very high speed such that his "clock" (age) slows