AST201_midterm1_solutions

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Department
Astronomy & Astrophysics
Course
AST201H1
Professor
Michael Reid
Semester
Winter

Description
UNIVERSITY OFTORONTO ASTRONOMY 201H1 MIDTERM TEST THURSDAY, FEBRUARY 3, 2011 DURATION: 45 MINUTES NO AIDSALLOWED UTORID: _________________________________ CIRCLE THE TUTORIALSECTION YOUATTEND: Monday Tuesday Wednesday 10:00 0101 -- Santiago -- 0601 -- Ivana 0602 --Alana 1101 -- Ivana 1102 -- Yevgeni 11:00 0201 -- Santiago 0202 --Alana 0701 –Adam 0702 -- Santiago 1201 --Alana 1202 -- Yevgeni 12:00 0301 -- Sergei 0302 -- Greg 0801 -- Natalie0802 -- Jeffrey 1301 -- Sergei 1302 -- Natalie 13:00 0401 -- Wayne 0402 -- Greg 0901 --Adam 0902 -- Jeffrey 1401 -- Sergei 1402 -- Yevgeni 14:00 0501 -- Wayne 0502 -- Jeffrey 1001 --Adam 1002 -- Emma 1501 -- Emma 1502 -- Wayne 1601 – Emma 1602 – Natalie - - 15:00 Instructions: 1. ON THIS PAGE: Fill in your UTorID (e.g. smithm1) and circle your tutorial section. 2. ON THE NEXT PAGE: Fill in your name (as it appears on ROSI), your student number, and your UTorID (e.g. smithm1). 3. ON THE SCANTRON CARD: Fill in your last name, first initial, and student number in the spaces given and, using pencil, darkly shade in the corresponding bubbles. Then sign the card. 4. For each multiple choice question, mark your answer in pencil on the Scantron card by darkly shading the appropriate bubble. All answers to multiple choice questions must be transferred to the Scantron card. Under no circumstances will answers to multiple choice questions written on this paper be accepted. 5. Answer short answer questions in the spaces provided. Answers written in pencil will not be re- marked. 6. Mark values are indicated with each question. 7. Make sure that your midterm has 9 pages. AST 201 MIDTERM 1, WINTER 2011 PAGE 1 OF 9 NAME: __________________________________ UTORID: ________________________________ STUDENT NUMBER: _____________________ Question Marks A1-A20 (MC) 20 B1 /8 B2 /2 B3 /3 Total for Part B /13 AST 201 MIDTERM 1, WINTER 2011 PAGE 2 OF 9 PARTA: Multiple choice questions. CIRCLE THE MOST CORRECTANSWER (1 mark each) 1. Which of the following best defines the term “Universe” (in reference to the Universe as a whole): (a) all of the planets, the Sun, and the stars (b) everything we can see with a single telescope (c) all of the galaxies which are visible from Earth (d) all space, time, energy, and matter * (e) everything we can see, back until about 400,000 years after the Big Bang 2. What distinguishes the observable Universe from the Universe as a whole? (a) the observable Universe is the part of the Universe that can be seen with current telescopes (b) the observable Universe is the part of the Universe that the laws of physics allow us to see, in principle * (c) the observable Universe is the part of the Universe we have already mapped out (d) the Universe as a whole is about 400,000,000,000 times larger than the observable Universe (e) nothing 3. The observable Universe is separated from the rest of the Universe by a: (a) cloud of gas and dust (b) horizon * (c) large number of stars and galaxies (d) large void (e) impenetrable barrier of dark energy 4. The average distance between stars in the neighbourhood of the Sun is closest to: (a) 2 million light years (b) 50 astronomical units (AU) (c) 3 light years * (d) 10 billion kilometers (e) 100,000 light years 5. When we look at the center of the Milky Way galaxy, we see it: (a) as it was, millions of years ago (b) as it was, thousands of years ago * (c) as it is now (d) as it will be, thousands of years from now (e) as it will be, millions of years from now AST 201 MIDTERM 1, WINTER 2011 PAGE 3 OF 9 6. Which of the following sequences correctly orders these objects from smallest to largest size? (a) Earth, Milky Way, the Sun, Jupiter, Local Group, Pleaides star cluster (b) Jupiter, Earth, the Sun, the Local Group, Pleaides star cluster, Milky Way (c) Earth, Jupiter, the Sun, Pleaides star cluster, Local Group, Milky Way (d) the Sun, Earth, Jupiter, Pleaides star cluster, Local Group, Milky Way (e) Earth, Jupiter, the Sun, Pleaides star cluster, Milky Way, Local Group * 7. What is meant when we say that astronauts in space experience “zero-g”? (a) That there is no gravity in space (b) That the astronauts are in a microgravity environment (c) That the acceleration due to gravity in space is approximately zero (d) That the astronauts orbit Earth so fast, it is as though there is no gravity for them (e) That the astronauts are in free-fall while orbiting * 8. The mass of the Sun is about one thousand times that of Jupiter. If the magnitude of the force of gravity exerted by Jupiter on the Sun is F andJShe magnitude of the force of gravity exerted by the Sun on Jupiter is F , SJat is the correct relationship between these two quantities? (a) F SJ1000 x 1000 x F JS (b) F = 1000 x F SJ JS (c) F SJF * JS (d) F SJF /1JS0 (e) F SJF /(JS00 x 1000) 9. What does the Doppler shift of an object tell us about it? (a) its colour (b) its speed toward or away from us * (c) its temperature relative to its surroundings (d) its composition (e) its absolute temperature in K 10. Compared to an isolated oxygen (O) atom, a molecule of carbon monoxide (CO) can emit and absorb light at: (a) any frequency (b) more frequencies * (c) the same set of frequencies (d) fewer frequencies (e) no frequencies AST 201 MIDTERM 1, WINTER 2011 PAGE 4 OF 9 11. Compared to a white star, a blue star is: (a) hotter * (b) larger (c) older (d) richer in argon (e) colder 12. When a rocket blasts off from the surface of the Earth, how does it successfully overcome the pull of Earth's gravity? (a) The rocket fuel is ejected at high speed and it pushes against the atoms in Earth's atmosphere. (b) The rocket fuel cancels out gravity. (c) The rocket fuel exerts the same force upward on the rocket as the rocket exerts downward on the rocket fuel. * (d) The rocket ejects a huge amount of mass, some of which is converted to energy, which pushes the rocket up. (e) The rocket fuel heats the air underneath the rocket, causing it to expand dramatically, pushing the rocket up. 13. When four hydrogen atoms are combined in a nuclear fusion reaction to produce one helium atom, the mass of the resulting helium atom is ______________ the sum of the masses of the four hydrogen atoms. (a) greater than (b) equal to (c) less than * (d) not related to 14. Antimatter is: (a) a rare and exotic form of matter that can only be produced in huge particle accelerators,
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