Transcript L19-Review2
Review for Quiz 2 NATS 102 Announcements Quiz 2 happens next class. Bring your 1 page “cheat sheet” Bring your calculator Study the last quiz (questions will be similar) Note that your paper is far more important Don’t panic Science News As reported in The Economist (29 March 2008, pg 205), a study at Florida State University indicates that people do not make good decisions on low blood sugar. Eat before exams Coulomb’s law Two negative particles are 10 inches away from each other, do they feel a repulsive or attractive force? These particles are moved to 30 inches away from each other. By what factor precisely does the force that they inflict on each other change? They are moved back to 10 inches distance, but now one has a charge that is twice that of before. How does the force differ from the original set-up? Light How can light be described in terms of electric and magnetic fields? What are particles of light called? What is the equation that relates the wavelength of a light particle to its energy? Which has a higher energy: UV light and radio waves? Which has a longer wavelength: UV light and visible light? Thermal Radiation What is the mathematical expression the provides the power of radiation emitted per unit surface area by a body of temperature T? Express the power unit of Watts in terms of meters, seconds, kilogram. What is the equation that relates the wavelength of a light particle to its energy? Which has a higher energy: UV light and radio waves? Which has a longer wavelength: UV light and visible light? Thermal Radiation Cont. What the power of radiation emitted per unit surface area by a body of temperature 30,000 K? Compare the total power of two round objects (two stars). Both star A and star B are 20,000 K, but star B has a radius 2 times that of star A. How much more power does star B emit? Star A is 20,000 K and Star B has a temperature twice that of star A How much more power does star B emit? Thermal Radiation Cont. What the power of radiation emitted per unit surface area by a body of temperature 30,000 K? Compare the total power of two round objects (two stars). Both star A and star B are 20,000 K, but star B has a radius 2 times that of star A. How much more power does star B emit? Star A is 20,000 K and Star B has a temperature twice that of star A How much more power does star B emit? Greenhouse Effect What is the Greenhouse Effect? Describe what radiation is involved? What defines a greenhouse gas? What are examples of greenhouse gases? Global Warming What are three measurements that indicate that the Earth’s atmosphere is, on average, warming? (Provide numbers) Atoms What defines an element? What is alpha, beta and gamma decay? How in detail does carbon decay work? What is the parent element? How is it made? What is its half life? What is the daughter element? What does this technique date precisely? What does uranium U238 date? Atomic Electron Energy States What can cause an atomic electron to jump to a higher energy state? What kind of additional “particle” is involved? How does the energy of this particle relate to the lower initial energy state, E1, and the higher final energy state? What how does the particle’s wavelength relate to its energy? Electronic Structure What defines the sequence of the periodic table? What defines the rows of the table? How does ionic, covalent, and metal bonding work? Suppose you have a molecule consisting of two atoms ionically bonded. From which two columns might these atoms belong? Geology: The rock cycle What are sedimentary, metamorphic & igneous rocks? How do they manifest the rock cycle? What are examples of each kind of rock? Geology: Plate Tectonics Define plate tectonics. What evidence is there for plate tectonics?