Physics Incident x-rays have a wavelength of 0.3120 nm?

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Incident x-rays have a wavelength of 0.3120 nm and are scattered by the "free" electrons in graphite. The scattering ange is 135 degrees. What is the magnitude of the momentum of
a.) the incident photon and
b.) the scattered photon

h= 6.626x10^-34 j*s
c=2.998x10^8 m/s

I have tried and tried this in multiple ways. Could anyone show me all of the steps and the answer. If possible, can you explain how you got the formulas and such. I have my final next week and this is one of the review problems that are supposed to be similar! Thank you!!
 
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