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You want to give an electron an evergy of 25kev in a Compton Collision. What is the minimum initial photon energy you need?

Equations:

[tex]\Delta[/tex][tex]\lambda[/tex]= h/m_{e}c(1-cos([tex]\theta[/tex]))

E=mc^{2}

E=hv=hc/[tex]\lambda[/tex]

I'm not really sure where to start from here. I know the answer is 138kev but I am not sure how to go about getting it.

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# Electron Energy in Compton Collision

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