Astronomy Midterm 2011 Solution

Astronomy Midterm 2011 Solution - ' ASTRONOMY 1F03 MIDTERM...

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Unformatted text preview: ' ASTRONOMY 1F03 MIDTERM EXAM DURATION OF THE EXAMINATION 1 HOUR Dr. J._Wadsley J Name: S O L, U TI 0 N Wednesday, Oct 19th, 2011 . Student ID: INSTRUCTIONS: Answer all questions. No books are allowed. 7 THIS EXAMINATION PAPER INCLUDES 4 PAGES AND 10 QUESTIONS. YOU ARE RESPONSIBLE FOR ENSURING THAT YOUR COPY OF THE PAPER IS COMPLETE. ‘ BRING ANY DISCREPANCY TO THE ATTENTION OF YOUR INVIGILATOR. 1. Describe three things that Galileo observed contradicting the idea of perfect heavens with Earth playing a special role at the centre of the universe. “- Neon: org/“HA, :79 [spar .... SUQS’FO'ES I0 =— (Phares of Venus _—— Mounkqfny 'cmcf Graham? 04 4/1wa MOOKL [3 of s) 2; (a) Briefly state Kepler’s First Law about the shape of planets’ orbits around the Sun. Ortgl‘tfl' are, QUI‘FTEJ fix/IPA 'I/Lxé Sun Q1“ 0042 OCR/5'. (b) Briefly state Kepler’s Second Law about the rate at which planets move on their orbits. OVEN/J rupee? Quid fl7uq/ cifeflqj [In 517%,: (1/ Jim 9 r (6) Briefly state Kepler’s Third Law about the relationship between the size of a planets orbit and the period of that orbit. fijeqm‘ Q 3. (a) The Sun emits radiation in manner close to a perfect black body. Wien’s law predicts that, with a surface temperature of about 6000 degrees Kelvin, the wavelength of the peak of the spectrum is at about 500 nanometers. Write down Wien’s Law. Wmeiéflgtg q: orificm 0r 300(000 m, * F“ ) "TI/O l I‘N (b) Jupiter’s surface has a temperature of about 125 degrees Kelvin. What is the peak wavelength of the light emitted from Jupiter? 4) p 300( ooo-‘W '2 Z'5X(o”§m 4. (a) What sets {the fundamental limit to the resolution of single telescopes? _ ‘ x . l ' i 9) 'éwwcwdenfifil > [Dr iCFQOfW 0 r1 (9 0{ ’__" . T ' _ - D 6 Et Cicada“ ' of {VF/{far (b) What can be done to increase the resolution of a single telescope given this limit? MW Q éijger mirror What physical effect prevents optical telescopes on Earth from achieving this limit? $885613 (or atmomfahco‘c 7L0ré>uienC€> 5. (a) Describe the process of differentiation as it applies to the composition of solid materials such as dust grains in the early solarsystem. Rmmeer Gait) action) Mel’EUFC/ / rooéj amid? (a lone-1r" Solar SDJRM. [car (Form (hm \ m OUi‘ef—Joidr‘ 5331604 , (b) What are the key differences between asteroids and comets? Mam foo/9) 5mm Mam Come)“ 9ij [Q96 mint: 6. (3.) Why does Mars have a very thin atmosphere now? Low mm of MQFJ,qé(aweO/( QWoJPfiere “f0 65(57): 5an SPQCQ (b) Describe a least two pieces of evidence for the existence of water on Mars; ‘ .K river VQU‘EJJ‘ «litre/Perms QOS‘E v7 gyro/(35A CFv-EPEFS r {‘09 (“fl 0(in CFQ/‘QFS r Sara’s ' 2—» I€€(0lr13 WQl'fif to \M/afyr of More) 7. (a) Consider an extra—solar planetary system viewed edge-on from earth. The presence - of a planet causes the star to move with a velocity of 40 m/s in a circular orbit. This implies it moves between +40 m/s (towards) and —40 m/s (away) with respect to the observer. Consider an absorption line observed from the star centred at 600 nm. What variation in the wavelength would be seen as a result of the presence of the planet? ' :Doppl‘er‘ - 231$ p. 7‘7305 r C 9w“ "'1 fl” éOOQm (Am-fig: I ['1‘ jag)é06 em :— 57? 7?? 72m»: '3 éoobooognm (b) What other likely observable effect would the presence of this planet have on observations of hesal"? “ l t t Transrij ‘ (offefllg) 8. What are the positions of the Moon and Sun in the sky during the highest tides (spring tides)? List all possible configurations. (It may help to draw diagrams). Also state the phases of the moon during a spring tide. ' -’ fun 6,1 new moon OVErLléQO/Ci’looa)7 50a % Wazoofl (neon) J 1m (ii 0 , Cy “ €00 flroon ( n4) " 0 on (Fe - _ 1 0’ [ff > Coffouee) J > 9. Saturn’s moon Mirnas has an orbit around Saturn with a semi—major axis of 200,000 km and takes a period of 1 day to complete an orbit. If Saturn’s moon Titan has an orbit with a semi-Inaj or axis of 1,200,000 km, estimate how long it takes to orbit Saturn. - . 2. H. ’3) fl 3 P "" w qrnjhm k CaflCF/[f ‘9 0’4— _ r a2 3 k: 4 or 5U“ Mr‘Md’ GYM:th ? gears, Q A U! (P 10. _ (a) Which planets have rings? I A“ </0 Wan fflda 6H t daffle r/ 512er , you a), Aha/Mung (b) How are rings thought to be formed? ' ' [15¢ Moonf' Niall Leann/[Glacier Man R0049 Lr‘mh“ [NZVZ firing} (6:05;?) lbs @1457 deffiry Cc? and éfiahef a {71/13 ...
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This note was uploaded on 02/11/2012 for the course ASTRONOMY 1f03 taught by Professor Wadsley during the Spring '11 term at McMaster University.

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Astronomy Midterm 2011 Solution - ' ASTRONOMY 1F03 MIDTERM...

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