mt2C - Astronomy 10 - Fall 2008 Midterm 2 November 13, 2008...

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Unformatted text preview: Astronomy 10 - Fall 2008 Midterm 2 November 13, 2008 This test has 40 multiple-choice questions. You need Scantron form 882-E to take it. You are allowed to use a calculator and one page (double-sided) of written notes. All other materials and references should be put away. Note the list of equations and physical quantities attached to the back of this test. Be sure to write your full name , SID , and section number on your Scantron form. 1. THIS EXAM IS VERSION C. PLEASE ANSWER C TO QUESTION 1. 2. Which of the following sequences of evolutionary phases is in the correct order for a low-mass star? (a) protostar, main-sequence star, red giant, white dwarf (b) white dwarf, main-sequence star, protostar, red giant (c) main-sequence star, red giant, white dwarf, protostar (d) protostar, red giant, main-sequence star, white dwarf 3. Many massive stars are surrounded by HII regions. These glow because of (a) heated dust grains. (b) light reflected from the massive star. (c) electrons and ions recombining. (d) nuclear fusion in the HII region. 1 4. Molecular clouds radiate mainly in what part of the electromagnetic spectrum? (a) X-ray (b) ultraviolet (c) radio (d) optical 5. What will happen to the Sun just after it exhausts its core hydrogen supply? (a) Its core will contract, but its outer lowers will expand and cool, so that the star becomes fainter. (b) Its core will contract, but its outer layers will expand, so that the star becomes bigger and brighter. (c) The Sun, being supported by degeneracy pressure, will remain the same size as it cools and dims. (d) Since it can no longer generate nuclear energy, it will collapse in on itself to form a black hole. 6. Sunspots are cooler than the surrounding solar surface because (a) they penetrate more deeply into the surface. (b) they contain more metals, which cool rapidly. (c) they are more opaque than surrounding gas. (d) they have strong magnetic fields, which impede convection. 7. The effective temperature of the Sun is 5800 K. What is the peak wavelength of the solar spectrum? (a) 145 nm (b) 290 nm (c) 500 nm (d) 2900 nm 2 8. Which of the following is closest in mass to a maximum-mass white dwarf? (a) the Moon (b) the Earth (c) Jupiter (d) the Sun 9. In the triple reaction, three helium nuclei fuse to create one carbon nucleus, with a net energy release of 7.275 MeV. How many reactions per second are necessary to sustain a stellar luminosity of 50 solar luminosities? ( Note: 1 MeV is equivalent to 1 . 602 10- 6 erg.) (a) 1 . 64 10 40 (b) 1 . 44 10 41 (c) 1 . 74 10 41 (d) 1 . 54 10 42 10. The Sun fuses hydrogen through the PP chain. What are the dominant nuclear reactions in a10....
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This note was uploaded on 07/09/2010 for the course ASTRO 10 taught by Professor Norm during the Fall '06 term at University of California, Berkeley.

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mt2C - Astronomy 10 - Fall 2008 Midterm 2 November 13, 2008...

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