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Im stuck on the following question and I can't seem to arrive at the answer at the back of the book.

X-Rays from Palladium with a wavelength of 0.0590 nm, are scattered backwards from collisions with electrons. The X-Rays that return along their original path have a wave length of 0.0639nm.

I've used DeBroglies formula to calculate the momentum of the incoming and outgoing photons. But I'm not reallty sure what to do at this stage.. Any help would be wonderful.

Thanks :)