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## Main Question or Discussion Point

I apologize in advance for this dumb question, I think I know the answer but I just want to be sure.

A photon has energy E = pc = hf

Do the Energy-Momentum transformations:

apply

Or must we introduce certain corrective terms? Let's say all this takes place in free space.

A photon has energy E = pc = hf

Do the Energy-Momentum transformations:

apply

__to photons?__**exactly**Or must we introduce certain corrective terms? Let's say all this takes place in free space.