Easy physics test

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timer Asked: Dec 10th, 2018
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Has to be done well. All of the items tagged bellow are the topics that will be covered on the test. Please let me know if you have any questions bellow I am willing to answer.

Name _________________________________ I.D. Number _______________________ Unit 6 Evaluation Physics 2 (SCIH 036 058) This evaluation will cover the lessons in this unit. It is open book, meaning you can use your textbook, syllabus, and other course materials. To submit the evaluation, follow the directions provided. When you feel you are adequately prepared, complete this Unit Evaluation. It is important that you do your own work. If you have difficulty with particular sections, you may use your textbook and course materials for help in answering the questions. You may also use your calculator on this evaluation. After you have completed this evaluation, you will submit it for grading. Multiple Choice Choose the answer that best completes the statement or answers the question. ____ 1. Which statement best fits the current model of the atom? a. Electrons exist in discrete orbits around the nucleus (like the paths of planets around the sun). b. The nucleus is stable but the electron cloud is unstable. c. Electrons exist at discrete energy levels and in regions of probability around the nucleus. d. The nucleus determines the physical and chemical properties of the atom. ____ 2. The energy of a photon is directly proportional to its a. wavelength. b. frequency. c. size. d. speed. ____ 3. What conditions would cause the most number of electrons to be ejected from a photosensitive metal via the photoelectric effect? a. dim, low frequency light b. bright, low frequency light c. dim, high frequency light d. bright, high frequency light Unit 6 Evaluation SCIH 036 ____ 4. The absorption of a photon by a metal atom is an all or nothing process. a. true b. false ____ 5. The photoelectric effect suggests that light interacts with matter as a wave. a. true b. false ____ 6. How does light behave? a. as a wave when traveling through space and as a particle when interacting with matter b. as a particle when traveling through space and as a wave when interacting with matter c. as both a wave and a particle at all times ____ 7. De Broglie suggested that all particles have a wavelength that is inversely related to the momentum of the particles. a. true b. false ____ 8. The electron microscope makes use of the _____________ nature of electrons. a. wave b. particle ____ 9. When electrons move down from a high energy orbit to a lower energy orbit _______ are emitted. a. photons b. protons c. electrons d. neutrons Unit 6 Evaluation SCIH 036 ____ 10. What happens to the size of the inner electron orbits when the charge in the nucleus increases? a. they get larger b. they get smaller c. they stay the same ____ 11. What is quantum physics? a. study of motion at very small (atomic level) distances b. study of motion at very high speeds c. study of motion near very large masses ____ 12. Which of the following are nucleons? a. protons b. protons and neutrons c. protons, neutrons, and electrons d. protons, neutrons, electrons, and positrons ____ 13. What determines the identity of an atom? a. the number of protons b. the number of neutrons c. the number of electrons ____ 14. According to your textbook, what determines the chemical properties of an atom? a. number of protons b. number of neutrons c. number of nucleons ____ 15. What determines which isotope is present? a. number of protons b. number of neutrons c. number of electrons Unit 6 Evaluation SCIH 036 ____ 16. What is the best way to describe the strong force? a. an attractive magnetic force b. a repulsive electric force c. an attractive nuclear force d. an attractive gravitational force ____ 17. A nucleus needs a certain ratio of _________ to __________ to make it stable. a. protons, electrons b. protons, neutrons c. neutrons, electrons ____ 18. A lone neutron will decay into a. a proton plus an electron. b. an electron plus a positron. c. a positron plus a neutrino. ____ 19. Particles that decay spontaneously and emit particles and energy are said to be a. elemental. b. nuclear decay. c. radioactive. d. isotopes. ____ 20. All atoms with atomic numbers greater than ______ decay in one way or another. a. 63 b. 73 c. 83 d. 93 ____ 21. Which types of radiation are deflected by a magnetic field? a. alpha and beta b. beta and gamma c. gamma and alpha Unit 6 Evaluation SCIH 036 ____ 22. Rank the types of radiation from least penetrating to most penetrating. a. alpha particles, gamma rays, beta particles b. gamma rays, beta particles, alpha particles c. alpha particles, beta particles, gamma rays d. gamma rays, alpha particles, beta particles ____ 23. What is the half life of radium? a. 1620 b. 3240 c. 4860 d. none of the above ____ 24. Based on Figure 39.13 in your textbook, if you started with a 100 kg mass of radium, how much would have decayed after 3240 years? a. 25 kg b. 50 kg c. 75 kg d. 100 kg ____ 25. How does an atom change when it undergoes alpha decay? a. its atomic number increases by 4 b. its atomic number decreases by 4 c. its mass number increases by 4 d. its mass number decreases by 4 ____ 26. How does an atom change when it undergoes beta-minus decay? a. its mass number increases by 1 b. its atomic number increases by 1 c. its mass number decreases by 1 d. its atomic number decreases by 1 Unit 6 Evaluation SCIH 036 ____ 27. How is the ratio of carbon-14 to carbon-12 in a living organism related to the ratio of carbon-14 to carbon-12 in the atmosphere? a. greater in the living organism than the atmosphere b. greater in the atmosphere than in the living organism c. the same in the living organism and the atmosphere ____ 28. What happens to the ratio of carbon-14 to carbon-12 in an organism after it dies? a. ratio of C-14 to C-12 increases b. ratio of C-14 to C-12 decreases c. ratio of C-14 to C-12 does not change much ____ 29. Uranium dating has been used to determine that the oldest Earth-rocks are _____ old. a. 1.2 million years b. 2.2 million years c. 3.7 billion years d. 4.2 billion years ____ 30. What is the most damaging form of radiation? a. alpha particles b. gamma rays c. beta particles d. positrons ____ 31. The energy we get in nuclear reactions comes from a. the sun. b. energy we put into the reactor. c. water. d. the mass of the fuel. Unit 6 Evaluation SCIH 036 ____ 32. Nuclear fusion releases energy when a. heavy ions fuse together. b. very light nuclei fuse together. c. uranium splits into two fragments. d. uranium emits a neutron. ____ 33. Nuclear fusion occurs typically in a. the upper atmosphere. b. uranium mines. c. the sun. d. all of the above. ____ 34. Nuclear fission occurs when a. we cut nuclei in two with a very small cutting device. b. electrical forces inside a nucleus overpower nuclear forces. c. one nucleus bumps into another causing a chain reaction. d. a nucleus divides spontaneously, with no apparent reason. ____ 35. The primary fuel for a nuclear fusion reactor is a. hydrogen. b. helium. c. uranium. d. plutonium. Carefully check your answers on this evaluation and make any corrections you feel are necessary. When you are satisfied that you have answered the questions to the best of your ability, transfer your answers to an answer sheet. Please refer to the information sheet that came with your course materials. Unit 6 Evaluation SCIH 036 BLANK PAGE

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School: New York University

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