I'm stuck with these questions. Please help if you can. In Rutherford's experiment, alpha-particles were directed at a thin gold foil. A small fraction of the alpha-particles were back-scattered. Explain how this result would be affected if each of the following changes was (separately) made. a) A thicker foil was used b) Higher-energy alpha-particles were used. c)A silver foil was used - the atomic number is less than that of gold. c) is fine, I can do that. But a) and b) I seriously need help. For a) I can thick of two things ... 1) alpha particles will get absorbed. If 1) is right, why is this? 2) because alpha particles will encounter more nucleus of more atoms, there will be more deflected alpha-particles. For b) I have no idea. I'm guessing there will be more deflection but can't explain.