E = hf what sort of Energy is this?

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WWCY
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Homework Statement


Is this E - say of an electron - the very E in E2 = (mc2)2 + (pc)2?

If it isn't, what sort of Energy is this?

Help is greatly appreciated!

Homework Equations

The Attempt at a Solution

 
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This is the E of a photon, a massless particle. So yes:
WWCY said:
the very E in E2 = (mc2)2 + (pc)2?