Compton scattering, formulae question

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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)mc2=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 Eincident - Escattered ---or in other words initial minus final...isn't convention final-initial? Why do we subtract initial minus final in this case?
 

Answers and Replies

  • #2
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The final is subtracted because the scattered photon will have a lower energy than the incident photon (since some of it has gone to the electron).
 
  • #3
vela
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Apply conservation of energy to the situation.

This question really doesn't belong in the advanced physics section.
 

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