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midterm - AST 101 Introduction to Astronomy First Midterm...

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AST 101 Introduction to Astronomy 1 First Midterm Exam (10/5/2007) Instructions A. Answer ALL questions on your Opscan, using a #2 pencil. B. Make sure to include your NAME and STUDENT ID . The computer identifies you by your student ID; do not forget to include it. C. Do NOT mark your date of birth. D. The exam is CLOSED BOOK . You should not use any books or notes. E. Time: 50 MINUTES . F. MULTIPLE-CHOICE QUESTIONS: Choose the one alternative that best completes the statement or answers the question. 1. A gas heated to millions of degrees would emit a. mostly X rays. b. mostly ultraviolet light. c. mostly radio waves. d. an equal amount of all wavelengths of light. e. no light, because it is too hot. 2. According to the universal law of gravitation, if you double the masses of both attracting ob- jects, then the gravitational force between them will 3. Astronomers infer that the universe is expanding because distant galaxies all appear to _________. 4. At which lunar phase(s) are tides most pronounced ( e.g ., the highest high tides)? a. full moon b. first quarter c. new moon d. both new and full moons e. both first and third quarters
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AST 101 Introduction to Astronomy 2 5. Each of the following describes an "Atom 1" and an "Atom 2." In which case are the two atoms different isotopes of the same element? 6. Each of the following lists two facts. Which pair of facts can be used with Newton's version of Kepler's third law to determine the mass of the Sun? a. Earth rotates in one day and orbits the Sun in one year. b. Mercury is 0.387 AU from the Sun and Earth is 1 AU from the Sun. c. Earth is 150 million km from the Sun and orbits the Sun in one year. d. The mass of Earth is 6 x 10 24 kg and Earth orbits the Sun in one year.
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