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Is anyone else bothered by the Elisha Huggins article in TPT which
analyzes photons gaining energy as they "fall" using mg(delta Y) =
-delta E? He says that he gets the right answer, but Bohr got the
right answers for the hydrogen atom energy states. Why did he do it
this way, and should we teach our students this? I'm not good enough
at general relativity (long ago and far away) to present a proper
derivation, but I thought most on here settled on mass being the
absolute value of the momentum 4-vector; so, photons don't have rest
mass. Does GR let us treat the photon like Huggins does in this
article?