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## Homework Statement

Find the energy of an x-ray photon that can impart a max energy of 50keV to an electron by compton collision

## Homework Equations

∆λ=h/mc(1-cos(theta)) where m = mass of electron

E=hf

(to be honest, not entierly sure if these are all you need, or if you need them... sorry :( )

## The Attempt at a Solution

∆λ=2.43*10^-12 (set theta to 90 because i am dealing with a maximum)

corresponding change in f = c/2.43*10^-12 from above

and since E=hf

∆E=510551 eV which is unfortunatly, larger than the E delivered to the electron... so CLEARLY i've stuffed up... I was planning on being able to say that the energy was 50keV + ∆E so i guess i'm on the wrong track... very wrong... any hints would be very greatly appreciated :!!)