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week 4

by: Eric Doman
Eric Doman
GPA 4.0

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week 4
Physics 2
Kenneth Voss
Class Notes
Black body Radiation
25 ?




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This 20 page Class Notes was uploaded by Eric Doman on Saturday October 1, 2016. The Class Notes belongs to PHY206 at University of Miami taught by Kenneth Voss in Spring 2016. Since its upload, it has received 5 views. For similar materials see Physics 2 in Education, Physics at University of Miami.


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Date Created: 10/01/16
2/3/16 Today’s lecture will give us the principles behind: How we get sea surface (and land) temperatures over the globe Physics 206
 Wednesday 2/3/16 Possible explanation for Deflategate? Finish 18.6 and 19.1-19.2 How to figure air consumption Radiation and Blackbody radiation differences with depth when diving Avogadro’s number Ideal gas Lecture 10 Sample emissivities Thermodynamics Metal pots used in cooking on top of a stove are usually very shiny on the top and sides. Which one of the following choices indicates why this is a good Polished Aluminum ε = 0.05 idea thermally? Rough Aluminum ε = 0.07 a) The shiny parts of the pot have greater thermal conductivity. Anodized Aluminum ε = 0.77 b) The shiny parts of the pot have greatly reduced losses via convection. Black Paint ε = 0.9 c) The shiny parts of the pot have greatly reduced losses via radiation. Water ε = 0.95 d) The shiny parts of the pot have greatly reduced losses via conduction. Soil ε = 0.38 e) The shiny parts of the pot do not allow any heat to be lost to the environment. Note reflectance of soil much higher than water Ice (snow about the same) ε = 0.97 1 2/3/16 Thermodynamics Thermodynamics Just before spring arrives, an airplane flies over some mountains and drops black Two sealed containers are initially at the same temperature and have the same soot on the snow and ice. This procedure is done to prevent flooding of the valley dimensions. The outer surfaces of container A appear to be polished below when the warmer weather arrives with spring. How does this procedure aluminum. The outer surfaces of container B are roughened gray cast iron. A prevent flooding? large, bright incandescent light bulb is brought near both containers and shines on them for equal amounts of time from the same distance. Within which a) The areas where the soot fails should melt earlier than those without the soot as container, if either, will the temperature increase at the fastest rate? sunlight will be absorbed. Melting the snow gradually reduces the amount that will melt as temperatures rise in spring. a) A b) The soot increases the temperature at which snow and ice melt causing the b) B areas that have soot to melt later. c) The temperature of both containers will increase at the same rate. c) The soot lowers the temperature at which snow and ice melt causing the areas that have soot to melt earlier. d) The soot has a higher thermal conductivity than water and ice and can transmit heat from the air more efficiently to the snow and ice underneath the soot. e) Air convection warms the soot covered snow more efficiently than the snow without soot. Ideal Gas Ideal Gas A container with a piston-lid contains an ideal gas at An ideal gas in a container with a piston lid has a pressure temperature T = 27 C and a volume V . The temperature po=1atm, volume V , ano temperature T = 300Ko The o o piston lid is pushed in, reducing the volume to V /2. At is increased to T = f27 C while the pressure is kept o the same time, the temperature is reduced to T = 15fK. constant. What is the new volume? What is the final pressure? Answer is A (Hint: pV = N k T) A: V o constant pressure Answer is C B: (127/27)V A: 1 atm o B: 2 atm C: (4/3) V o C: 4 atm D: (3/4) V o D: 0.5 atm E: None of these. E: None of these. 2 2/3/16 Reading Assignment Friday 2/5/16 19.4-19.5 Monday 2/8/16 19.6 3 2/5/16 This class we will see •  The connec-on between classical mechanics Physics 206
 and thermodynamics Friday 2/5/16 •  How fast gases or smells can travel across the room…… 19.4 •  How a factor which affects the speed of sound varies with temperature. Lecture 11 Kinetic Theory Choose the correct statement of the following Adjusting which of the following parameters will cause a significant increase in the mean free path of the average molecule in a gas? A) The pressure of the gas is equal to the total kinetic energy of the molecules in a unit volume of a) decrease the temperature the gas B) The product of pressure and volume of the gas is b) decrease the average velocity always constant C) The average kinetic energy of a molecule of the c) increase the temperature gas is proportional to its absolute temperature d) decrease the diameter D) The average kinetic energy of a molecule of the gas is proportional to the square root of its absolute e) increase the diameter temperature 1 2/5/16 Reading Assignment At sea level, the mean free path of air molecules is approximately 6 × 10 m. At an altitude of 100 km, the mean free path is approximately 0.1 m. Which one of the following statements best explains this difference in Monday 2/8/16 19.7-19.8 mean free path? Assume that the air behaves as an ideal gas. a) The diameter of air molecules is smaller at high altitudes than it is at seaednesday 2/10/16 19.9 level. b) The air temperature is lower at high altitudes than it is at sea level. c) The air pressure is higher at high altitudes than it is at sea level. d) The air concentration is smaller at high altitudes than it is at sea level. e) The diameter of air molecules is larger at high altitudes than it is at sea level. 2


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