5. What is the maximum energy that can be transferred to an electron in a hard collision by a 25-MeV (a) electron (according to convention), (b) positron, (c) proton, (d) α-particle?   Answers are 5. (a)12.5MeV. (b)25MeV. (c)0.0552MeV. (d)0.0138MeV   Please show your work.

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