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PH214_2007SPRING_EXAM3_PROFSOLN_[0]

PH214_2007SPRING_EXAM3_PROFSOLN_[0] - Ph 214 Spring 2007...

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Ph 214, Spring 2007 Exam # 3 Multiple Choice Name: (no name, no score !) Multiple Choice Answer Sheet # Answer 1, 2. 3. 4. 5. 6. 7, 8. 9, 10. 11. 12. 13. 14. 15, 16. 17. Subtotal /85 1
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Ph 214, Spring 2007 Exam # 3 Multiple Choice Name: (no name, no score !) 1. [5 pts] A particle with the spatial wave function ψ ( x ) = Ae ikx = A [cos kx + i sin kx ], where A and k are constants, can be thought of as a plane wave traveling along the x-axis. Which of the following statements most accurately describes the probability of finding the particle at any location along the x-axis? (A) It is equally likely to find the particle anywhere along the x-axis. 2. [5 pts] The positronium “atom” consists of an electron and a positron bound together by their mutual Coulomb attraction and moving about their center of mass, which is located halfway between them. Thus the positronium “atom” is somewhat analogous to a hydrogen atom. The ground-state of hydrogen is 13.6 electron volts. What is the ground-state binding energy of positronium? (B) 1 2 × 13 . 6 eV 3. [5 pts] Two coherent sources of visible monochromatic light form an interference pattern on a screen. If the relative phase of the sources is varied from 0 to 2 π at a frequency of 500 Hz, which of the following best describes the effect, if any, on the interference pattern? (E) It is not destroyed but simply shifts positions at a rate too rapid to be detected by the eye. Questions 4 and 5 : A particle with rest mass m and momentum mc/ 2 collides with a particle of the same rest mass that is initially at rest. After the collision, the original two particles have disappeared. Two other particles, each with rest mass m
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