UT AST 309L - Review Questions for Fourth Exam (3 pages)

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Review Questions for Fourth Exam



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Review Questions for Fourth Exam

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Pages:
3
School:
University of Texas at Austin
Course:
Ast 309l - Search for Extraterrestrial Life
Search for Extraterrestrial Life Documents

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AST 309L Review Questions for Fourth Exam Spring 2007 This test covers Chapters 8 through 10 plus Contact That means it covers the results for the Drake equation communication and travel It will ask you for your values for N and r and for an analysis of the consequences of your numbers A Evaluation of the Drake Equation 1 Two students have evaluated their Drake Equations Happy Feller gets N 2 5 1011 while Mr Average Guy gets N 9 4 105 Who will calculate the larger r How many stars would one have to search before finding the nearest civilization given each of their estimates for N 2 Another student Angela Angst takes L 100 years Does Angela think two way messages are possible What does it mean if your estimate for N is less than one 3 Given your estimate for N would you expect your estimate for r to go up or down if the Sun were closer to the center of the galaxy B Communication with Extraterrestrial Civilizations 1 Describe the spectrum of electromagnetic radiation identifying the various wavelength regions Indicate which are higher in frequency and shorter in wavelength 2 Why are radio waves generally favored as the wavelength region for interstellar communication What range of frequencies is best What are the arguments for this range 3 Explain three suggestions for magic frequencies 4 Draw a diagram showing how a vertically polarized electromagnetic wave can produce an alternating current in an antenna 5 Explain how a radio telescope works 6 Describe the problems of recognizing and decoding signals What features should a signal have in order to make it easier to recognize and to be decoded Describe AM FM analog and digital signals 7 Make up a message by coding a picture into a series of 1 s and 0 s 8 Describe the pulsars and OH maser emission Why don t we think these are signals from ETI 9 Describe the methods and results of Project Ozma and Project Ozma II 10 Describe the META and BETA projects 11 Describe the NASA search for extraterrestrial intelligence ETI and



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