## What kind of qualitifcations do you need to teach physics?

I mean teach physics at universities.. I know you need a Ph.D and MS of course, but there are a lot of branches in physics, do you have to study something particular or simply anything that has to do with physics?
Also what is the difference between someone who has a Ph.D (a Doctor) and a professor? I'm not sure if it's the same thing..

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