Calculate the Rutherford cross section for a 10 MeV alpha particle scattered at firstly an angle greater than 90 degrees and secondly for an angle greater than 10 degrees. What does the relative magnitudes tell you in relation to the probabilities of the momentum transfer at large and small angles? I cna calculate the cross section for those two values but what does the second part of the question mean? I am too confused about this part of the question. How does momentum transfer enter the Rutherford problem? Any help would be greatly appreciated !