{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Physics20A F02 FINAL EXAM

Physics20A F02 FINAL EXAM - VERSION B Monday PHYSICS 20A...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 4
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 6
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 8
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: VERSION: B Monday June 10, 2002 PHYSICS 20A BUOTE FINAL EXAM Clear your desk except for a pencil, eraser, and calculator Possibly Useful Information: ‘% Um I“ 5““ ‘Cr' “if 9(arcseC)=206’2655 F(d2 )0!2 = F(d1)d12 Am“ = conjsqtant AQL Vr = — F = (constant)T4 P2=a3 . . ‘\ . 1. The wavelength ofa wave is 2 meters. The frequency of the wave is 2 H2. What is the speed ofthe wave? A. lm/s B. 0.25n1's C. loin/s D. 4m/s 2. What evidence do we have that liquid water once existed on the suface ofMars? A. dry river beds B. whale bones C. sedimentary rocks D. high atmospheric humidity at the present time 3. What is always true when an object accelerates? A. Itspeeds up. B. It changes direction. C. Its mass changes. D. A force is acting on it. 4. In 2000 BC, the Babylonians noticed that the Vernal Equinoxlay in the constellation Ares. 2000 years later, the Vernal Equinoxlay in the constellation Pisces, and now it is moving into the constellation Aquarius. Why does the constellation associated with the Vernal Equinox keep changing? A. precession of the Earth's polar axis B. the consteilations are always moving C. diumalrnotion D. retrograde motion 5. Which of the following planets is least likely to retain a thick atmosphere? A. a planet with a hot atmosphere, low gravity B. a planet with a cool atmosphere, high gravity C. a planet with a hot atmosphere, high gravity D. a planet with a cool atmosphere, low gravity 6. Why is the surface ofVenus so hot? A. Frequent volcanic eruptions heat the lower atmo5phere. B. Venus absorbs nearly all of the solar radiation that strikes it. C. The surface is heated by radioactivity in surface rocks. D. Infrared radiation emitted by the surface can't escape into space. 7. What do all main sequence stars have in common? A. They are all the same age. B. They all have the same mass. C. They are all cons urning hydrogen in their cores. D. They all have convective cores. Page 1 3. The same telescope is used to obtain an irmge using light of the following wavelengths. Which of the images will have the poorest angular resolution? A. infrared 13- blue C. red D. yellow L. 9.. Consider planets A and B orbiting some star. Ifthe fluxofstellar radiation received by planet A is 4 times that received by planet B, what is the ratio of the orbital distance ofB to A? A. 2 B. 4 C. 8 D. 16 10. In the outer 20% ofthe Sun‘s atmosphere (interior to the photosphere), energy is transported by A. radiation. B. winds. D‘ convection. D. magnetic fields. 11. The fact that during 21 Lunar Eclipse the Earth has never been seen to cast a flat shadow on the Moon was used by whom to argue that the Earth is spherical? A. Aristotle B. Aristarchus C. Hipparchus D. Ptolemy 12. About how rrnny 4 meter telescopes would be required to match the light gathering power of a 15 meter telescope? 13. Which of the following is NOT true about the Moon? A. The time it takes the Moon to cycle through its phases is called the "s iderial month". Reflected sunlight is responsible for the observed brightness of the Moon. The quarter Moon phase occurs exactly twice per complete phase cycle. The relative positions ofthe firth, Moon, and Sun detemiine which phase is observed froma given place on Earth. 905 14. In the horizon coordinate system, the angular distance above the horizon is called the azimuth. zenith. meridian. altitude. POP”? Page 2 ' 15. A shift in the direction ofan object caused by a change in the position ofan observer is called A. precession. B. parallax. C. the Coriolis effect. D. epicycle motion. 16. What is the final evolutionary state for a star like the Sun? A. white dwarf B. neutron star C. black hole D. planetary nebula 17. The process where two light nuclei combine to forma more massive nucleus is A. fission. B. fusion. C. the same process reSponsible for rocket propulsion. D. the same process used in nuclear reactors. 18. An H-alpha emission line of Hydrogen is a downward transition between what two energy levels? A. Zandl B. 3andl C. 3and2 D. 4and2 19. The Sun will run out offuel in about A. 5 million years. B. Strillion years. C. Sbillion years. D. 5 thousand years. 20. In the laboratory, an atom emits a spectral line at a wavelength of400 nanometers. In the spectrum of a star, the same spectral line is found to have a wavelength of410 nanometers. What can be said about the star? A. It is hotter than the Sun. B. It contains elements that are not found on Earth. C. It is moving toward the Earth. D. It is moving away fromthe Earth 21. Why are there more train sequence stars than giant stars? A. The main sequence stage for a star is longer than the giant stage. 13- Giants are dim and hard to see. C. Few stars first form as giants rather than main sequence stars. D. Most giant stars are drawn to the core of the galaxy. 22. What object is located at one focus ofthe orbit of the planet Mars? the earth Mars the sun Jupiter POE”? Page 3 ' 23. Which ofthe following atmospheric gases accounts for the high surface temperature of Venus? A. oxygen B. hydrogen C. argon D. carbon dioxide 24. Ifthe diameter ofthe Earth were suddenly reduced to one-fourth of its present size while its mass remained the same, how would your weight be altered? A. It would remain unchanged. B. It would become 16tirnes as great. C. It would become 8 times as great. D. It would become 4times as great. 25. Ifthe Sun stopped producing energy in its core, approximately how long would it be before we would see the Sun start to become significantly dimmer? A. lOOyears B. lyear C. 8 minutes D. 100,000 years 26. What produces aurorae? A. chemicalreactions in the upper atmosphere B. reflection of sunlight by high clouds C. meteors D. collisions of high energy particles with atmospheric gas /\ i 27.. The Sun has a temperature of6000 K and is brightest at a wavelength of about 5000 A. What is the temperature 'k/ ofa star that is brightest at a wavelength of about 10,000 A? A. 8000K B. 10,000K C. 12,000K D. 3000K 28. The structure of the solar corona is best observed in what part of the energy spectrum? . X-ray near ultraviolet visible microwave pow> 29. For precisely which phase ofthe Moon did Aristarchus show that geometry could be used to determine the distance to the Sun? . new CI'CS cent quarter full Dow> Page 4 ' 30. A continous spectmmis emitted by A. a hot and dense gas B. a cool and dense gas C. ahot and low-density gas D. a cool and low-density gas 31. What was significant about Galileo‘s discovery ofJupiter's four brightest satellites? A. It showed that Jupiter is the most massive planet. B. It showed that there are some objects which do not orbit the earth. C. It showed that theories that a planet can only have one satellite are wrong. D. It showed that sortie satellites have atmospheres. 32. Most of the stars in a typical H-R diagram fall on the A. supergiantregion. B. giantregion. C. white dwarfregion. D. main sequence. 33. The Earth‘s polar axis is not perpendicular to the ecliptic. This is the origin ofthe . seasons. diurnal motion. day. yean Dow> 34. The temperature ofthe solar photosphere is approximately A. 600K B. 6000K C. 60,000K D. 1,000,000K €57. A cannon of mass 20kg shoots a cannon ball ofmass 1 kg. Ifthe acceleration imparted to the cannonball is 40 m/s/s, what is the magnitude ofthe acceleration experienced by the cannon? A. 40m/s/s ‘ We 13.4m/s/s /-’ " ‘ ’ -.~' C. 2rn/s/s r "‘0 '7 fir’ .[I D. 1/2 m/s/s " 36. How does the impact theory of the origin of the Moon account for the differences between the chemical compositions ofthe Earth and the Moon? A. When the Moon formed it was very hot. 13. The Moon is partly made from material from the body which hit the Earth. C. The composition of the Moon has been altered by objects that have hit it. D. Most of the firth-like material has sunk to the center of the Moon. Page 5 ' 37. The temperature of the solar corona is approfimately A. 600K B. 6000K C. 60,000K D. 1,000,000K 38. Which ofthe following forms of electromagnetic waves (or photons) has the greatest energy? A. Xray B. ultraviolet C. visible D. infrared E? A hypothetical planet orbits the Sun a distance of4 AU. What is its orbital period? A. Syears B. 64years C. 4years D. 16years 40. 'An object has an angular size of 12 arcseconds and a linear diameterD in some units. A second object has an angular size of 3 amseconds and a linear diameter ofSD. How many times farther away is the second object than the first object? A. 10times ’26,“: :5...” ’l/ B. ZOtimes m“ mm: %. C. 30tirnes ,2 ‘ . D. 40tirnes 41. For a planet orbiting the Sun. what can be said about the energy ofthe planet when the planet is farthest away fromthe Sun? A. It is all thermal energy. B. The kinetic energy is maximum C. The potential energy is maximum D. The sum of kinetic+potential+thennal energy is a minimum 42. In the Heliocentric Model, two planets have orbital periods of3 years and 4years, respectively. What is the synodic period of the 4—year planet as seen fromthe 3-year planet? A. lyear B. 1.33 years C. 7 years D. 12years 43. Over 99% ofthe visible matter in the universe is in what state? A. solid B. liquid C. gas D. radiation Page 6 ’ 44. In Ptolemy‘s Geocentric model epicycles were introduced primarily to explain the A. retrograde motion of the planets. B. prograde motion ofthe planets. C. variation of the speed ofa planet during its orbit. D. diurnal motion. 45. According to Kepler's Second Law, ifa planet at perihelion moves 10 times as fast than when at aphelion, what is the ratio ofthe distance from the Sun at aphelion to that at perihelion? A. 1/10 E. 10 C. about3 D. about 1/3 46. The conservation ofangular momentumis the underlying physical principle responsible for A. Newton's second law. B. Newton's third law. C. Kepler's second law. D. Kepler's third law. 47. Ifthe temperature of a black body doubles, the amount of radiant energy it produces will increase by A. 4times. B. 16times. C. Stimes. D. 2times. 43. When a planet moves eastward with respect to the stars it is said to undergo A. retrograde motion. B. prograde motion. C. diurnaln‘otion. D. precessionalmotion. 49. Which ofthe following processes will result in the emission ofa photon? A. the electron in an atomjumping to a lower energy level B. an atom becoming ionimd C. the electron in an atom remaining in the ground state D. the electron in an atomjumping to a higher energy level 50. An inferior planet has a sidereal period of 1/2 years. What is its synodic period as seen from Earth in the Heliocentric model? A. 11'2 B. 1 C. 3/2 D. 2 Page 7 ...
View Full Document

{[ snackBarMessage ]}