Physics20A S02 MIDTERM EXAM 2 Version C

Physics20A S02 MIDTERM EXAM 2 Version C - VERSION C PHYSICS...

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Unformatted text preview: VERSION: C PHYSICS 20A BUOTE MIDTERM EXAM #2 Clear your desk except for a pen/pencil/eraser and calculator Possibly Useful Information: c = )Lf 6(arc sec) = 250,000” F<d2)d2 = mod? Am = °°“;ta‘“ Aft v1. — F = (constant)T4 1. For electromagnetic waves the product of the frequency and wavelength is the A. energy. B. speed of sound. C. Speed oflight. D. amplitude. 2. If the Earth orbited the Sun at only 0.5 AU the brightness ofthe Sun on the Birth would be A. larger by a factor of 4. B. larger by a factor of 2. C. smaller by a factor of 4. D. smaller by a factor of 2. 3. A particle of light is a A. photon. B. spectrum C. graviton. D. proton. 4. At the surface ofsome planet in the solar system the average Speed ofa molecule of gas X is equal to the escape velocity. But the average speed of a molecule of gas Y on the planet's surface is only one-seventh the escape velocity. What can one say about the atmosphere of the planet? A. It consists ofboth X and Y. B. It consists onbut not X. C. It consists ofX but not Y. D. It consists ofneither X nor Y. 5. Which of the following is NOT true about a blackbody? A. It absorbs all of the light that falls on it. B. It emits radiation more efficiently than it is absorbed. C. The radiation which it emits depends on the temperature. D. The surface temperatures of the planets are approximately those deduced as if they were actually blackbodies. 6. Suppose a blackbody is brightest at a wavelength of one micron. Ifthe temperature of the blackbody is halved. at what wavelength would it be brightest? A. lrnicron B. Zmicrons C. 4microns D. 0.5 microns 7. Ifthe temperature of an object doubles, the amount of radiant energy it produces will increase by A. 2times. B. Stimes. C. 16times. D. 4times. Page 1 10. 11. 12. 13. 14. 15. The process where a heavy nucleas splits into two less massive nuclei is A. fusion 13. fission. C. the proton-proton chain. D. the same process responsible for rocket propulsion. What is believed to be the origin ofthe Earth's magnetic field? A. currents in the Earth's core B. pockets of solar magnetism captured from the solar wind C. permanent magnetism left over fromthe formation of the Earth D. the flow ofionized gases in the Earth's upper atmosphere What is the primary reason that aurorae are more likely to be seen in Canada and Alaska than in Iowa? A. Aurorae are sunlight reflected from snow, which is more common in Canada. B. It is cloudy much more often in Iowa than in Canada. C. The particles that produce aurorae strike the atmosphere only near the poles. D. Aurorae can only be seen above the Arctic Circle. The Moon keeps the same face turned toward the Earth because it A. rotates in a retrograde direction. B. rotates once per revolution about the Earth. C. does not rotate. D. rotates once per year. The lunar soil was produced by A. meteoroid impacts. B. the solar wind. C. the escape of gases fromthe interior ofthe Moon. D. violent volcanic eruptions. The giant impact theory attributes the origin of the Moon to the impact ofa Mars-size body with the Earth. Which of the following is both a true statement and supports the impact theory ofthe Moon's origin? A. The impacting body sank inward to fon'nthe Earth's core. 13. The impact was the same event that caused the extinction ofthe dinosaurs. C. The composition ofthe Moon is similar to Earth's but somewhat different. D. The scar left by the impact can be identified with the Pacific Ocean. Why does the thick atmosphere ofVenus lead to a high temperature at its surface? A. The atmosphere blocks the escape of infrared radiation from Venus. B. The atmosphere reflects most sunlight back into Space. C. There are heat-producing chemical reactions in Venus's atmosphere. D. High winds in the thick atmosphere generate frictional heating. The atn‘nsphere of Venus is primarily made up of nitrogen. water vapor. carbon dioxide. helium 53.05”? Page 2 16. 17. 18. 19. 20. 21. 22. 23. What method has been used to map the surface of Venus? A. infrared sensors on flyby missions 13. careful telescopic measurements fromthe Earth C. images frommany landers D. orbiting radar What evidence do we have that liquid water once existed on the suface of Mars ? A. dry river beds B. sedimentary rocks C. whale bones D. high atmospheric humidity at the present time What was the result of the life-detection experiments that were carried out on the Viking missions to Mars 7 A. No clear—cut evidence of life was detected. The life—detection experiments mysteriously disappeared. B. C. No life was found, but numerous organic compounds suggest life in the past. D. Microbial life was found. How does the atmosphere of Mars compare to that of the Earth? A. Mars's atmosphere is warmer, drier, and lower in pressure. B. Mars ’5 atmosphere is colder, drier, and higher in pressure. C. Mars's atmosphere is colder. drier, and lower in pressure. D. Mars '5 atmosphere is colder, wetter, and higher in pressure. What happens to the angular momentum of a planet as it orbits the Sun? A. It remains constant. B. It increases steadily with time. C. It gradually drops to zero. D. It increases and decreases as the planet changes speed. Which of the following is NOT true about weight vs mass? A. weight is aforce B. mass equals weight divided by the acceleration due to gravity C. a person's mass on the Moon is the same as it is on the Earth D. mass can be measured in Newtons You measure the wavelength ofa known type of source to be larger than measured when the source is at rest in the laboratory. You can infer that the source is moving towards you. the source is moving away from you. the source is moving around you in a circular orbit. the frequency also must be larger. COP”? As discussed in class, astronomers want to build telescopes with as large a mirror as possible for the benefit of light—gathering power only. angular resolution only. . wavelength resolution. both light-gathering power and angular resolution. can? Page 3 24. Which ofthe following is not true for an ideal gas? 25. 26. 27'. 28. 29. 30. A. B. C. D. The pressure is proportional to the temperature. Ifthe pressure is held constant, then a gas with higher temperature will also have higher density. If the temperature is held constant, then a gas with higher pressure will have higher density. It is a system of particles that exert no forces on each other. For a planet orbiting the Sun which of the following is true when the planet is at perihelion? A. B. C. D. the speed of the planet is smallest the kinetic energy is largest the potential energy is largest the kinetic energy and potential energy are equal. The largest tides on Earth occur POP”? only when the Moon is at waxing quarter phase. only when the Moon is at waning quarter phase. at either waning or waxing quarter phases ofthe Moon. when the Moon is full. How would the energy flux of the Sun measured at the Earth change ifthe Sun's luminosity increased by a factor of4 and the Earth-Sun distance was larger by a factor of 2? A B. C. D. it would stay the same it would be larger by a factor 0f2 it would be smaller by a factor of2 it would be larger by a factor of 8 Compared with infrared waves, radio waves A. B. C. D. have shorter wavelengths. have higher energy. take much longer to reach us from celestial objects. are lower frequency. How does the brightness of an object vary with distance from an object? A. B. C. D. It remains constant with varying distance. It varies as the inverse ofthe distance. It decreases as the square ofthe distance. It decreases as the cube ofthe distance. Ifthe temperature of a blackbody doubles what can be said about the wavelength where the blackbody is brightest? POP”? it will increase by a factor of 2 it will increase by a factor of 16 it will decrease by a factor of2 it will decrease by a factor of 16 Page 4 H'fdl/Ofo Quiz #5 Astronomy, 20A W06, UCI 4,} (Time: 15 minutes) [{ X The giant planets are primarily made of methane. (a ’l’ 2. The Great Red Spot is like a hurricane on Earth. F X The temperatures in the magnetosphere of Jupiter are cooler than the center of the Sun. 1' 4. The semimajor axis of Neptune's orbit is A. 2 AU. 5.2 AU. 30 AU. D. 100 AU. Ev If you could find a large enough ocean, which one of these planets would float in it? . Uranus . Saturn C. Neptune D. Mars k‘ Why are not all clouds on Jupiter white, as on Earth? @ because they are made of methane B. because they are made of carbon dioxide Q because of impurities in the ice crystals in them . for the same reason that we see colors in rainbowson Earth 7. The clouds on Saturn move around due to A. the Coriolis effect alone. B. solar heating and the Coriolis effect. @ solar heating, the COriolis effect, and convection. D. solar hearing, the Coriolis effect, convection, and conduction. 8. Synchrotron radiation comes from Jupiter because Jupiter has a magnetic field. B. electrons are light. C. 10 produces many ions. D. it is non-thermal radiation. 9. Ocean tides on Earth are only caused by the Moon. 1: l0. The Sun has a stronger tide on Earth than does the Moon, because it is much more massive than the Moon. F ‘ 11. Tidal resonances produce gaps in Saturn‘s rings. '( Page 1 K Ocean tides are at their maximum 9 when the Moon is in its first-quarter phase. . when the Moon is in its full Moon phase. . when the Moon is in its third-quarter phase. D. only in summer. . What is the phase of the Moon when it is locally high tide? A. full Moon (E). new Moon C. first quarter . any lunar phase . The 24-hour rotation period of Earth on its axis A. has always been 24 hours. has been speeding up since Earth was formed. has been slowing down since Earth was formed. D. is tidally locked to that of the Moon. K The planet with the strongest tidal effect is A. Earth. Page 2 e\ ...
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