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## Homework Statement

An X-ray source of wavelength gamma is directed at a sample; determine the maximum speed of scattered electrons.

## Homework Equations

KE=([itex]\gamma[/itex]-1)mc

^{2}=hc/[itex]\lambda[/itex] - hc/[itex]\lambda[/itex]

^{'}

## The Attempt at a Solution

I've been provided with the solution using the formula above, however it looks like it's E

_{incident}- E

_{scattered}---or in other words initial minus final...isn't convention final-initial? Why do we subtract initial minus final in this case?