Spring 2002 Exam IIMULTIPLE CHOICE QUESTIONS (50 pts.)Choose the BEST answer to each of the following questions using what you have learned inASTR 101. Indicate your choice on the scantron. (2 pts. each)1. For the diagram below which spectrum would you observe?Diagram will be given in Discussion SectionA. continuousB. absorptionC. emissionD. blue shiftedE. red shifted2. The smaller the parallax angle for a star,A. the less massive the star.B. the more massive the star.C. the smaller the distance to the star.D. the greater the distance to the star.E. both A and C3. By combining information from both the light curve and spectrum of Algol, the demon star,astronomers have been able to determineA. the age of Algol.B. that Algol has a black hole companion.C. the amount of interstellar dust between Algol and Earth.D. that Algol is about to blow up.E. the diameters of the stars in this eclipsing binary.4. Ozone in the Earth’s stratosphereA. is the most abundant atmospheric greenhouse gas.B. breaks down infrared radiation.C. absorbs much of the incoming ultraviolet solar radiation.D. forms when ordinary oxygen mixes with freon.E. has been building up as a result of industrial combustion.5. The speed of light through a vacuum isA. greatest for red light due to its longer wavelength.B. greatest for blue light due to its higher photon energy.C. greatest for only the shortest wavelength photons.D. the same for all types of electromagnetic radiation.E. dependent on the frequency of the electromagnetic radiation.6. The mass of Jupiter was first calculatedA. from analysis of the motions of its moons.B. using its distance from the Sun and its rotational period.C. using its angular size and distance from Earth.D. using data from spacecraft flybys.E. by measuring the time that it takes for the Red Spot to disappear from view.7. The gas tail of a comet develops whenA. part of the nucleus drifts in the direction opposite to the comet’s motion.B. the solar wind pushes away gases that has sublimated from the nucleus.C. gravitational forces pull loosely held material toward the Sun.D. gravitational forces pull loosely held material out of the Sun toward the comet.E. the comet nears aphelion.8. The granules seen in the solar photosphere are believed to be energy brought up from belowbyA. radiation.B. convection.C. conduction.D. rotation.E. volcanic activity.9. If you observe five objects that have different temperatures, the hottest object would be theone emitting primarilyA. radio photons.B. red photons.C. blue photons.D. ultraviolet photons.E. X-ray photons.10. Saturn is 10 times farther from the Sun than Earth. Comparing the intensity of sunlight atSaturn’s distance to the intensity on Earth, what can be said? A. It is the same.B. It is 10 times greater at Saturn.C. It is 10 times less at Saturn.D. It is 100 times greater at Saturn.E. It is 100 times less at Saturn.11. The naked-eye planets have been in the news lately becauseA. several new naked-eye planets have been detected.B. a collision is predicted.C. They are all visible in the western sky after sunset.D. They will all lie behind the Moon on May 5.E. They will all lie behind the Sun on May 5.12. If a scale model of the Solar System were constructed on the Byrd Stadium football field hereat the University of Maryland, where would the closest star (other than the Sun) be located?A. at Baltimore harborB. in Los AngelesC. in BostonD. somewhere in ChinaE. near the Moon13. An astronomer who wanted to observe a protostar would have the greatest chance for successusing ___________________ telescope.A. an infraredB. an X-rayC. an optical (visible light)D. an ultravioletE. a gamma ray14. The emission and absorption spectra of an element differ in which obvious way?A. The emission spectrum contains more lines.B. The absorption spectrum contains more lines.C. The emission spectrum is shifted to the left (toward the blue side) of the absorption spectrum.D. The emission spectrum is shifted to the right (toward the red side) of the absorption spectrum.E. The lines are in the same wavelength positions, but are bright for emission and dark for absorption.15. Using the Bohr atomic model representation, which atom has just emitted a photon?Indicate A or B or C =proton =electron Diagram will be given in Discussion Section16. Given H Alpha and H Beta absorption lines in this spectrum for a binary star, which drawingrepresents the positions of stars A and B at the time the spectrum was taken?Diagram will be given in discussion section17. Cygnus X-1 is a good black hole candidate. Astronomers know a lot about this objectbecause it is alsoA. a neutron star.B. a pulsar.C. in a binary system.D. in a star cluster.E. in our Solar System.18. If all of the polar cap material on Mars could be made to sublimate simultaneously, theMartian atmosphere wouldA. become thicker and the temperature would increase.B. become thicker and the temperature would decrease.C. become thinner and the temperature would increase.D. become thinner and the temperature would decrease.E. escape immediately.19. The core of an aging massive supergiant isA. layered with lighter elements in the center.B. layered with heavier elements in the center.C. uniformly composed of hydrogen and helium.D. uniformly composed of helium.E. composed of molecules containing mostly carbon and iron.20. A star at the center of a planetary nebula A. has just been born.B. is fusing hydrogen into helium in its core.C. will shortly become a supernova.D. is collapsing and will eventually stabilize as a white dwarf.E. will stabilize when hydrogen fusion produces enough energy.21. Halley’s comet is named after Sir Edmund Halley because A. he was the first person to see it.B. he correctly calculated its orbital period.C. although he had nothing to do with the comet, he was famous at the time.D. Galileo discovered it and named it after his friend.E. he was the British Royal Astronomer when the comet appeared.22. In Lab #8, Stellar Spectra, you used the distance modulus (spectroscopic parallax method) tofind the distance to “Bell’s cluster.” Why won’t the heliocentric parallax method (d=1/p) thatyou used in computer Lab #6 work? Because Bell’s clusterA. has a tilt so that parallax can’t be observed.B. is at a distance of more than 200 parsecs, too far to show a reliable parallax shift.C. moves so rapidly that no reliable measurement can be made.D. has no stars with a red shift.E.