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PCS229-final_exam_solutions -2007

PCS229-final_exam_solutions -2007 - PCS229 Final Exam...

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PCS229 Final Exam December 2007 1 RYERSON UNIVERSITY Department of Physics PCS 229 – Introduction to Medical Physics Final Exam, December 6, 2007 Prof. Dr. A. Pejovi ć -Mili ć STUDENT NAME: First name (please print) Last name (please print) ID NUMBER: Instructions: Be registered in the course to write the final exam Place student ID on the upper right hand corner of the desk for verification Do not leave the exam within the first 30 minutes, not enter the exam more than 30 minutes after it has begun or leave the exam within the last 15 minutes Conduct the exam in silence Duration of the exam is 2.5 hours The exam consists of 45 multiple-choice questions (parts I and II) and 5 numerical problems (part III) Do not guess answers. Solve problems in the space provided. If you need more space, use the back of the page (indicate this fact on the original page) This final exam is an open-book exam. This means that you can use/ have any PRINTED documents and/or books; Calculators are allowed; however, use of laptop computers and Internet is not permitted Have no pencil cases on desks only writing utensils. Place all cell phones/ personal audio equipment and other electronic devices in bags Place all bags , and personal belongings in a designated area in the room. No personal belongings can be brought to the exam desk Have no food or drink during the exam unless medically required Remove hats while writing the exam unless required by religious observance Raise your hands to ask a question, use washroom, or request additional supplies In the case of an emergency, leave all exam materials on the desk and follow the instructions of the invigilator SOLUTIONS “A genius is a talented person who does his homework.” Thomas Edison
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PCS229 Final Exam December 2007 2 PART I: Questions 1 to 17 are multiple-choice questions, 1 mark each. 1. What is the rest mass of an electron? a. 0.511 MeV b. 1.022 MeV c. 2.2 MeV d. 0.511 keV e. 1.022 keV 2. For pair production to occur in the vicinity of an 16 O nucleus, the incident photon must have energy of at least a. 0.511 MeV b. 1.022 MeV c. 2.04 MeV d. 0.511 keV e. 1.022 keV 3. The decay constant is:
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