An alpha particle with kinetic energy 11.0 MeV makes a head-on collision with a lead nucleus at rest. What is the distance of closest approach of the two particles? (Assume that the lead nucleus remains stationary and that it may be treated as a point charge. The atomic number of lead is 82. The alpha particle is a helium nucleus, with atomic number 2.)

Lecture 10: Testing about a Population Proportion The Basic Steps in Any Hypothesis Test: Step 1: Determine the null and alternative hypotheses. Step 2: Verify necessary data conditions, and if met, summarize the data into an appropriate test statistic. Step 3: Assuming the null hypothesis is true, find the p-‐value.