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# Size of a Light-Bulb Filament. The operating temperature

ISBN: 9780321675460 31

## Solution for problem 73E Chapter 17

University Physics | 13th Edition

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University Physics | 13th Edition

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Problem 73E

Size of a Light-Bulb Filament. The operating temperature of a tungsten filament in an incandescent light bulb is 2450 K, and its emissivity is 0.350. Find the surface area of the filament of a 150-W bulb if all the electrical energy consumed by the bulb is radiated by the filament as electromagnetic waves. (Only a fraction of the radiation appears as visible light.)

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Practice Exam 5 Leader: Hannah Course: BIOL 211 (2) Worksheet 5.6 Supplemental Instruction Instructor: Dr. Waldman Iowa State University Date: 04/12/16 Chapter 25 1.) What is evolution 2.) Explain how Jean Baptise de Lamarck’s formal theory of evolution differs from the theory of evolution by natural selection that Darwin and Wallace proposed 3.) Why was the theory of evolution by natural selection a revolutionary idea 4.) What inferences did Darwin and Wallace make about natural selection (i.e. what is the idea of natural selection based on) 5.) Evolution by natural selection occurs when ____________________ ___________________leads to differential ____________________ success. 6.) Selection acts on _____________________ while evolution acts on ___________________. 1060 Hixson­Lied Student Success Center v 515­294­6624 v sistaff@iastate.edu v http://www.si.iastate.edu 7.) The best definition of biological fitness is ______________. a. The ability of a population of organisms to persist b. The ability of an individual to successfully reproduce relative to other individuals in the population c. The ability of an individual to stay healthy by eating well­balanced meals and exercising d. The ability of a population to survive 8.) Define the following: a. Homolgy: b. Vestigial trait: c. Transitional trait: d. Struggle for existence: 9.) For the following statements, indicate whether they are true or false. a. “Evolution leads to more complex species progressing toward the ‘best’ species.” b. “The theory of evolution includes the Big Bang.” c. “The theory of evolution is an explanation for the origin of life on Earth.” d. “Evolution happened only in the past.” e. “Evolution is just a theory, not a fact.” f. “If humans evolved from apes, why are there still apes” Chapter 26: 10.) What is a population 11.) What does it mean for a population to be in Hardy­Weinberg Equilibrium a. Let’s say that right­handedness is a dominant trait (R) and left­handedness is a recessive trait (b). If 76% (131/173) of the class are right handed (RR or Rr) and 24% (42/173) are left handed (rr). What percent of the people in this class are heterozygous at the right­handed locus 12.) Match the following terms with their correct definitions: a. Intersexual selection 1. Equalizes allele frequencies between populations b. Intrasexual selection 2. Random and mostly deleterious c. Natural selection 3. Mate choice d. Genetic drift 4. Changes allele frequencies & phenotype e. Gene flow 5. Competition for mates f. Mutation 6. Random chance changes in allele frequencies 13.) Which of the following examples of natural selection in action would tend to increase the genetic variation in the population a. Alpine skypilots evolve large flowers above the timberline and small flowers below the timberline b. Natural selection simultaneously selects against heavy field mice (they starve during the winter) and light field mice (they freeze during the winter) c. Natural selection causes dragonflies to evolve longer tails d. Natural selection acts on beak size in finches such that those individuals able to eat small, soft seeds survive through the winter 14.) Which population would be affected by a genetic bottleneck a. A flock of migratory birds blown off course to a new island during a storm b. Finches that have higher survival if they have small beaks, because females prefer small beaks c. Survivors of a typhoon (only 4% of the population) showing darker spots than the initial population d. Green iguanas developing the ability to become brown Chapter 35: 15.) Where did humans originate How long ago 16.) How long ago was the most recent common ancestor between chimpanzees & humans 17.) True or False: Homo neanderthalensis and Homo sapiens did not overlap. Chapter 27: 18.) Fill in the following table regarding the 3 concepts used to identify species. Criteria used (2 Advantages Disadvantages/Limitations species differ or are…) Biological Species Concept Morphospecies Concept Phylogenetic Species Concept 19.) Identify whether the barrier is prezygotic or postzygotic. a. 2 frog species breed @ different times of the year: b. 2 bird species have different courtship songs & dances: c. 2 frog species mate but the hybrids are infertile: d. 2 cricket species mate but their gametes are not compatible: e. 2 species of warblers live in different parts of the tree: 20.) Which event would result in allopatric speciation a. An earthquake that isolates a population of rodents on a mountain from other populations of rodents b. Migration of birds back and forth between the mainland and an island c. A flood that separates a population of frogs on opposite sides of a large lake for a few months 21.) Which of the following is NOT true about sympatric speciation a. New species form in the same geographic area b. Reproductive isolation occurs c. Can be due to a change in the environment d. Species cannot take place in sympatry, only in allopatry, where geography poses a barrier to gene flow Chapter 52: 22.) What is the difference between abiotic and biotic factors 23.) Climate is ___________­term conditions in an area where weather is ___________­term atmospheric conditions. 24.) Briefly describe the major factors involved in climate patterns: temperature, precipitation, seasonality, and regional effects (of mountains & oceans). 25.) Compare the precipitation levels and temperatures of a desert and tropical rain forest. 26.) You are studying tree species diversity at 2 different sites. At site one you find 202 tree species, and in a same­sized plot at site two you find 12 tree species. Which is most likely true a. Site one is a tropical rainforest, and site two is a temperate deciduous forest b. Both sites are in a tropical rain forest c. Site one is in a temperate deciduous forest, and site two is in a tropical rain forest d. Both sites are in a boreal forest 27.) Aquatic biomes are distinguished by… a. Depth of water and rate of water movement a. The number and type of animal species that occur there b. Precipitation and availability of light c. Rate of water movement and availability of light 28.) Why are the spring and fall lake turnovers important for aquatic ecosystems a. Lake turnovers bring oxygen­rich water from the lake bottom up to the lake surface b. The turnovers bring nutrient­rich water from the bottom of the lake up to the top of the lake c. It forces normally bottom­dwelling species to the surface for twice­yearly production of vitamin D d. The lake turnovers allow the melting of winter ice 29.) Match the following marine biome zones with their correct description. a. Aphotic 1. Open ocean b. Benthic 2. Beach c. Photic 3. No sunlight d. Intertidal 4. Depths e. Oceanic 5. Until the end of continential shelf f. Neritic 6. Gets sunlight

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Size of a Light-Bulb Filament. The operating temperature