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## Homework Statement

The question I have is simple enough: at what energy do an electron and a photon have the same wavelength?

## Homework Equations

I know that for a photon, λ=[itex]\frac{hc}{E}[/itex] and for an electron, λ=[itex]\frac{hc}{\sqrt{E^{2}-mc^{2}}}[/itex]

## The Attempt at a Solution

I can't just equate the two, as that results in the absurd result mc^2=0. I can't think of a method that works. Are there any relativistic corrections that I've missed?