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Lesson 12 Quantum Mechanics Please look over the following review questions and exercises. If you are unsure of the answers, check your text and then the appendix that follows all the lessons in this course for the information. Do not submit these to your instructor. Review Questions Chapter 31, pages 620–621, questions: 1, 2, 3, 6, 8, 11, 15, 16, 17, 18, 20; Chapter 32, pages 633–634, questions: 12, 13, 14, 15, 16, 17, 19, 20, 21, 22, 24. Exercises 1. The photoelectric effect best demonstrates a. b. c. d. 2. In the photoelectric effect, the brighter the illuminating light on the surface, the greater a. b. c. d. 3. the number of ejected electrons the velocity of ejected electrons both of these neither of these A quantum of light is called a __________. a. b. c. d. e. 4. the wave nature of light the particle nature of light both of these none of these proton neutron electron notron none of these In the double slit experiment with electrons, the pattern observed on the screen is a. b. wave-like particle-like 12-11 PHYS 001 The Science of Physics c. d. neither of these both of these 12-12 Lesson 12 Quantum Mechanics 5. Quantum uncertainties are most predominant for simultaneously measuring the speed and location of __________. a. b. c. 6. The uncertainty principle applies not only to momentum and position, but to energy and time. a. b. 7. a baseball a spitball an electron True False According to the uncertainty principle, the more we know about a particle’s momentum, the less we know about its __________. a. b. c. d. e. kinetic energy mass speed location none of these 8. to represent the energy a. b. c. d. 9. Two photons have the same wavelength. They also have the same __________. a. b. c. d. 10. of the emitted photon difference between atomic energy states producing the photon both of these neither of these frequency energy both of these neither of these An electron and a baseball move at the same speed. Which has the longer wavelength? 12-13 PHYS 001 The Science of Physics a. b. c. the electron the baseball Both have the same wavelength. 12-14 Lesson 12 Quantum Mechanics 11. If a proton and an electron have identical momenta, the longer wavelength belongs to the a. b. c. 12. According to the uncertainty principle, the more we know about a particle’s position, the less we know about the particle’s a. b. c. d. e. 13. less kinetic energy than the absorbed photon’s energy more kinetic energy than the absorbed photon’s energy kinetic energy equal to the absorbed photon’s energy The Schrödinger equation is restricted to a. b. c. 16. affects the velocity of the particle has no affect on the velocity of the particle In the photoelectric effect, electrons ejected from bound states in the photosensitive material have a. b. c. 15. speed momentum kinetic energy all of these none of these According to quantum physics, measuring the velocity of a tiny particle with an electromagnet a. b. 14. proton electron Both are the same. submicroscopic particles submicroscopic particles and microscopic particles none of these Which of the following forms an interference pattern when directed toward two suitably spaced slits? a. b. light sound 12-15 PHYS 001 The Science of Physics c. d. e. electrons all of these none of these 12-16 Lesson 12 Quantum Mechanics 17. A beam of electrons has __________. a. b. c. d. 18. Heavy atoms are not appreciably larger in size than light atoms because the nuclei of heavy atoms have a. b. c. d. e. 19. theories of submicroscopic particles theories of macroscopic particles all good theories A new theory conforms to the correspondence principle when it a. b. c. d. e. 21. more mass more electric charge more nucleons all of these none of these The correspondence principle applies to a. b. c. 20. wave properties particle properties both of these neither of these corresponds to all theories in nature updates the essence of the old theory ties two or more theories together accounts for verified results of the old theory none of these The quantum mechanical probability cloud for the electron in the hydrogen atom has an average radius a. b. quite different from the radius predicted by Bohr that agrees with the orbital radius of Bohr 12-17 PHYS 001 The Science of Physics 22. An excited atom decays to its ground state and emits a photon of green light. If instead the atom decays to an intermediate state, then the light could be a. b. c. d. e. 23. The probability of finding a particle at a given point in space is a. b. c. d. 24. everything is completely random. there are certain limits on how accurately certain properties can be known. the position and momentum of microscopic particles are unknown. none of these Complementary properties a. b. c. d. 26. given by the frequency of the matter wave associated with the particle the square of the amplitude of the matter wave associated with the particle neither of these both of these The Uncertainty Principle states that a. b. c. d. 25. red violet blue any of these none of these are nice to each other produce great color schemes describe different aspects of an object are the same Young’s double slit experiment showed that a. b. c. d. e. electrons had wave-like properties. photons had particle-like properties. photons had wave-like properties. None of these is correct. All of these are correct. 12-18 Lesson 12 Quantum Mechanics 27. Nodes of de Broglie waves are a. b. c. d. e. positions of zero amplitude positions of zero probability of finding particles associated with the de Broglie wave indicative of the overtone level of the wave none of these all of these 12-19