Assignment Booklet 11 Atomic Physics Assignment Booklet 11 c. Identify the beta positive particle (by number), and explain the reason for your Atomic Physics choice. Value 25 Lesson 4: The Subatomic World C The following diagram of a bubble chamber shows the paths of an alpha particle, beta negative particle, beta positive particle and a gamma ray (labeled 1-4). The magnetic field is directed downward (into the page). d. Identify the gamma ray (by number), and explain the reason for your choice. a. Identify the alpha particle (by number), and explain the reason for your choice. Compare and contrast matter and antimatter. ci b. Identify the beta negative particle (by number), and explain the reason for your choice. Other than the electron-positron, provide an example of a matter-antimatter pair that you have studied previously in Physics 30