A beam of 7.7-MeV a particles scatters from a gold foil of thickness o 0.32 µm. (a) What fraction of the a particles scattered between 1.0° and 2.0⁰? (b) What is the ratio of a particles scattered through angles greater than 1.0° to the number scattered through angles greater than 5.0°? Greater than 90°?
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