Instructions: To prepare to learn about nuclear physics, you must first understand what radioactivity is. Read sections 39.1--39.4, and 39.11 in the Conceptual Physics textbook. On your own paper: Define the terms strong force, radioactive decay, alpha particle, beta particle, and gamma ray, Answer the Review Questions 1-7, 24, 25 at the end of the chapter. Answer the following question: What does the U in U-238 stand for? What is the difference between U-235 and U-238. Hold onto this paper. You will add more to it next class before you turn it in.