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

Previewing page 1 of 3 page document
View Full Document

Review Questions for Fourth Exam

Previewing page 1 of actual document.

View Full Document
View Full Document

Review Questions for Fourth Exam

78 views

Problems/Exams

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

• 3 pages

• 31 pages

• 9 pages

• 33 pages

• 34 pages

• 16 pages

• 49 pages

• 2 pages

• 31 pages

• 31 pages

• 7 pages

• 13 pages

• 54 pages

• 22 pages

• 21 pages

• 17 pages

• 30 pages

• 30 pages

• 2 pages

• 27 pages

• 19 pages

• 39 pages

• 36 pages

• 12 pages

• 50 pages

• 23 pages

• 24 pages

• 18 pages

• 31 pages

• 12 pages

• 55 pages

• 14 pages

• 41 pages

• 38 pages

• 49 pages

• 30 pages

• 39 pages

• 53 pages

• 31 pages

• 25 pages

• 53 pages

• 8 pages

• 5 pages

• 34 pages

• 27 pages

• 3 pages

• 14 pages

• 18 pages

• 17 pages

• 53 pages

• 17 pages

• 54 pages

• 46 pages

• 8 pages

• 17 pages

• 11 pages

• 17 pages

• 5 pages

• 55 pages

• 13 pages

• 8 pages

• 2 pages

• 18 pages

• 50 pages

• 49 pages

• 24 pages

• 3 pages

• 30 pages

• 7 pages

• 36 pages

• 20 pages

• 13 pages

• 25 pages

• 3 pages

• 25 pages

• 3 pages

• 4 pages

• 19 pages

• 53 pages

• 40 pages

• 17 pages

• 19 pages

• 31 pages

• 5 pages

• 30 pages

• 19 pages

• 20 pages

• 39 pages

• 5 pages

• 2 pages

• 10 pages

• 3 pages

• 8 pages

Unformatted text preview:

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

View Full Document

Unlocking...