Introduction to Astrophysics Final
Exam
Course Introduction
Introduction to Astrophysics is a foundational course that explores the physical principles governing celestial bodies and the universe. Students will investigate topics such as the life cycles of stars, the structure and dynamics of galaxies, black holes, cosmology, and the fundamental forces shaping the cosmos. Emphasis is placed on understanding observations of the night sky, the electromagnetic spectrum, and the use of telescopes and space probes. By applying concepts from physics and mathematics, learners will gain insight into the origin, evolution, and fate of the universe, preparing them for more advanced studies in astronomy and related fields.
Recommended Textbook Astronomy Preliminary Edition by Adam Frank
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Chapter 1: Getting Started: Science, astronomy, and Being Human
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Q1) Why is astrology a pseudoscience?
Answer: Although astrology uses precise data to make predictions,those predictions do not perform any better than random guesses.
Q2) Define a scientific theory and provide an example of one.
Answer: A theory is a well-developed body of knowledge that has been tested many times in many different ways.Examples include Newton's gravity,Einstein's relativity,natural selection/evolution,and many others.
Q3) How many orders of magnitude are there between the diameter of a planet like Earth and the typical size of a planetary system?
A) one
B) two
C) three
D) six
Answer: D
Q4) What kind of astronomical object is hundreds of millions of times smaller than the Milky Way galaxy?
Answer: Stars.
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Chapter 2: A Universe Made, a Universe Discovered
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Q1) Suppose that you observe the sky at midnight and see the star Betelgeuse just rising above the eastern horizon.Where will it be at 6 A.M.?
A) at its highest point
B) halfway between the horizon and at its highest point
C) the horizon
D) the opposite side of Earth
Answer: A
Q2) A resident of the Northern Hemisphere measures the length of daylight every day for a year.The longest day occurs on:
A) March 21.
B) June 21.
C) September 21.
D) December 21.
Answer: B
Q3) Why was the development of cities important to the development of astronomy?
Answer: Cities allowed specialized groups devoted to astronomical measurements to appear,and their longevity allowed detailed records of observations over long time scales.
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Chapter 3: A Universe of Universal Laws
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Q1) Sally Scientist applies an equal force to two objects.The first has a mass of 40 kg and the second has a mass of 10 kg.If the first object accelerates at 10 m/s²,what is the acceleration of the second?
A) 2.5 m/s<sup>2</sup>
B) 5.0 m/s<sup>2</sup>
C) 10 m/s<sup>2</sup>
D) 40 m/s<sup>2</sup>
Answer: D
Q2) The Copernican model required the solar system to be ________ than it was in Ptolemy's model.
A) older
B) younger
C) larger
D) smaller
Answer: C
Q3) Why did Ptolemy's work remain popular in Europe through 1500 CE?
Answer: Ptolemy's model made accurate predictions about the locations of objects in the night sky.It also supported the worldview of the Catholic Church.
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Chapter 4: A Universe of Universal Laws
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Q1) Which of the following causes blackbody radiation?
A) gravitational potential energy
B) thermal energy
C) latent heat
D) free energy
Q2) Stars twinkle because of:
A) interstellar dust.
B) surface variations on the stars.
C) atmospheric turbulence.
D) opacity variations.
Q3) What property of a star allows you to measure its composition?
A) the brightest color in its spectrum
B) the wavelengths of its absorption lines
C) its luminosity
D) its mass
Q4) The speed of a light wave:
A) increases with its frequency.
B) increases with its wavelength.
C) decreases with its amplitude.
D) is independent of its other properties.
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Chapter 5: The Architecture and Birth of Planetary Systems
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Q1) Giant planets attain their atmospheres through:
A) collisions of gaseous protoplanets.
B) migration.
C) binary accretion.
D) processes that are not yet well understood.
Q2) A bright,extended object appears in the sky one evening,visible to the naked eye.Over the next several weeks,it moves across the sky,becoming brighter as it approaches the Sun and then fainter again as it moves away.After six weeks,it fades away.This is most likely a(n):
A) supernova.
B) Earth-crossing asteroid.
C) Trojan asteroid.
D) comet.
Q3) The radial velocity method is best at detecting exoplanets with ________ orbital radii and ________ masses.
A) small; small
B) small; large
C) large; large
D) large; small
Q4) How do terrestrial planets form?
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Chapter 6: Home Base: Earth and Moon
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Q1) The Moon formed primarily from:
A) a captured planetesimal.
B) Earth's mantle.
C) Earth's core.
D) the same mixture of material as Earth.
Q2) Maria are:
A) captured moons of the gas giant planets.
B) massive volcanoes on Mars.
C) asteroids that trail in Jupiter's orbit.
D) dark areas on the lunar surface with relatively few craters.
Q3) Which of the following sequences correctly characterizes the composition of Earth's layers,from its center to its surface?
A) solid iron, molten iron, solid nickel, granite
B) silicate rocks, molten iron, silicate rocks
C) molten iron, silicate rocks, granite
D) solid iron, molten iron, silicate rocks
Q4) What can you conclude about a large region of the Moon's surface with relatively few craters?
Q5) Why are rocks on the ocean floors all younger than about 200 million years?
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Q6) How is the heat powering a shield volcano generated and transported?
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Chapter 7: Sibling Worlds: Mercury, Venus, and Mars
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Q1) Martian "blueberries" provide strong evidence for:
A) liquid water on Mars today.
B) subsurface water on Mars today.
C) liquid water in Mars's past.
D) biologic activity in Mars's past.
Q2) The iron cores of terrestrial planets were formed:
A) during the earliest phase of planetary formation.
B) once the planets had cooled significantly.
C) during massive magma flooding events.
D) by planetesimals from the outer Solar System.
Q3) Which terrestrial world has the least evidence for volcanism?
A) Mercury
B) Venus
C) Earth
D) Mars
Q4) How would Earth change if it were moved to Mercury's orbit? Consider its atmosphere,internal structure,magnetic field,and day-night cycle.
Q5) How does the massive Olympus Mons volcano on Mars show that Mars does not undergo plate tectonics?
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Q6) Why does Mercury lack a substantial atmosphere?
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Chapter 8: Gas, ice, and Stone: the Outer Planets
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Q1) Jupiter's Great Red Spot is a:
A) region of thick ammonium sulfide clouds.
B) hurricane.
C) region of powerful magnetic fields.
D) fixed and unchanging feature.
Q2) The light-colored bands on Jupiter are ________ regions.
A) high-velocity
B) low-velocity
C) high-pressure
D) low-pressure
Q3) How does the atmosphere of Titan compare to Earth's?
Q4) Which of the following is closest to the snow line in our Solar System?
A) 0.9 AU
B) 1.5 AU
C) 2.1 AU
D) 4.5 AU
Q5) Why do Uranus's moons have low densities?
Q6) What is the strongest evidence for liquid water on Callisto?
Q7) What aspect of Jupiter's near-space environment poses the biggest problem for satellites orbiting the planet?
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Chapter 9: Life and the Search for Habitable Worlds
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Q1) Which of the following is part of the science of astrobiology?
A) telescopic studies of exoplanets
B) biochemical experiments on molecular self-replication
C) searches for extraterrestrial civilizations
D) all of the above
Q2) Which discovery has challenged astronomers' methods in the search for extraterrestrial life?
A) radio astronomy
B) the greenhouse effect on Venus
C) bacterial colonies powered by radioactivity deep underground on Earth
D) water on comets
Q3) Suppose the inner edge of a star's habitable zone is at 2 AU.The star suddenly increases its luminosity by a factor of 4.Where is the inner edge of the habitable zone now?
A) 1 AU
B) 2 AU
C) 4 AU
D) 8 AU
Q4) Why is carbon so well suited to forming the building blocks of life?
Q5) Describe the physical structure of a DNA molecule.
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Chapter 10: The Sun As a Star
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Q1) What has provided the best data about the interior of the Sun?
A) helioseismology
B) sunspots
C) the Sun's evolving luminosity
D) solar X-rays
Q2) A sunspot has a temperature 80% as large as the rest of the Sun's surface.How much LESS light does it produce per unit area than the rest of the Sun?
A) 5% as much
B) 20% as much
C) 40% as much
D) 80% as much
Q3) Which of the following is NOT related to the solar magnetic cycle?
A) the number of sunspots
B) space weather
C) the solar neutrino problem
D) the strength of Earth's aurorae
Q4) How can heat be transported across a vacuum?
Q5) How does the Sun's rotation differ from Earth's?
Q6) What provides the energy for solar flares?
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Q7) Name three aspects of sunspots that depend strongly on the solar magnetic cycle.
Chapter 11: Measuring the Stars: the Main Sequence and Its Meaning
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Q1) Which of the following combinations of measurements CANNOT be used to determine a star's radius?
A) brightness and peak wavelength
B) angular size and distance
C) brightness, distance, and temperature
D) luminosity and peak wavelength
Q2) Stars A and B are identical,except that star A has a parallax of 0.1 arcseconds while star B has a parallax of 0.4 arcseconds.How does the brightness of stars A and B compare?
Q3) Which of the following is a relational property of stars?
A) radius
B) temperature
C) luminosity
D) distance
Q4) The Sun is expected to spend about 5 billion more years on the main sequence.If its luminosity increased suddenly to four times its usual value,how much time would it remain on the main sequence?
Q5) Why does luminosity increase with stellar mass on the main sequence?
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Q6) What aspects of a star change significantly during its time on the main sequence?
Chapter 12: Nursery of the Stars: the Interstellar Medium and Star Formation
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Q1) In what wavelength range do protostars emit most of their energy?
A) optical
B) radio
C) infrared
D) ultraviolet
Q2) A protostar becomes a star when:
A) its luminosity reaches a maximum.
B) its surface temperature reaches 5,000 K.
C) it loses all its gravitational energy.
D) nuclear fusion begins.
Q3) How do astronomers measure the properties of molecular clouds?
A) through emission lines of H<sub>2</sub>
B) through absorption lines of H<sub>2</sub>
C) through emission lines of tracer molecules like CO<sub>2</sub>
D) through interactions with nearby clouds
Q4) What is a proplyd?
A) the smallest form of molecular cloud
B) a bright knot in a protostellar jet
C) the visible result of colliding winds
D) none of the above
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Chapter 13: To the Graveyard of Stars: the End Points of
Stellar Evolution
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Q1) During part of its time as a red giant,a star remains at roughly the same temperature but increases in luminosity by a factor of 1,000.By what factor does its radius increase?
Q2) Why does the duration over which a massive star fuses elements decrease from hydrogen to iron?
A) The core temperature increases.
B) The star produces less energy per fusion reaction.
C) The core density increases.
D) all of the above
Q3) At which evolutionary stage do intermediate mass stars lose most of their outer layers?
A) white dwarf
B) asymptotic giant branch
C) red giant branch
D) main sequence
Q4) What is the source of most of the carbon and oxygen in the interstellar medium?
A) the Big Bang
B) nova explosions
C) supernova explosions
D) winds from asymptotic giant branch stars
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Chapter 14: Down the Rabbit Hole: Relativity and Black Holes
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Q1) An airline pilot spends a considerable fraction of his life traveling at a speed of several hundred kilometers per hour relative to his identical twin brother.How does the pilot's lifetime compare to that of his brother,all other things being equal?
A) The pilot's is slightly longer.
B) The pilot's is slightly shorter.
C) The pilot's is much longer.
D) The pilot's is much shorter.
Q2) Which of the following objects has the strongest tidal forces,assuming that each has the same mass?
A) black hole
B) white dwarf
C) neutron star
D) the Sun
Q3) An astronaut falls into a black hole that has 100 times the mass of the Sun.The astronaut sends signals to her partner,who sits at rest a large distance from the black hole.How far from the black hole's center is the astronaut when her signals can no longer reach her partner?
Q4) What are the three observable properties of black holes?
Q5) What produces the X-rays in an X-ray binary?
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Q1) Two stars orbit the center of the Milky Way with semimajor axes of 200 and 800 AU.If the first star has a period of 44 years,what is the period of the other star?
Q2) Which component of the Milky Way is primarily composed of old stars?
A) disk
B) halo
C) bulge
D) bar
Q3) What is the shape of the Milky Way's central component?
Q4) Which of the following provides evidence that the Milky Way's halo is an old system?
A) the lack of gas clouds
B) the chemical composition of the halo stars
C) the HR diagrams of globular clusters
D) all of the above
Q5) The development of infrared astronomy enabled the discovery of:
A) dark matter.
B) the first extrasolar planets.
C) low-mass stars.
D) the Milky Way's bar.
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Chapter 16: A Universe of Galaxies
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Q1) Which of the following lists astronomical distance measurement techniques in order of the maximum distance to which they are useful?
A) parallax, spectroscopic parallax, Hubble's law, Type Ia supernova
B) parallax, Cepheid variables, spectroscopic parallax, Hubble's law
C) parallax, Cepheid variables, Type Ia supernova, the Tully-Fisher law, Hubble's law
D) parallax, Cepheid variables, Type Ia supernova, Hubble's law
Q2) Why are the jets from radio galaxies compelling evidence that black holes power active galactic nuclei?
A) their extreme luminosity
B) their relativistic speed
C) their compact bases
D) all of the above
Q3) Which galactic phenomenon is triggered by the same process as spiral structure?
A) galactic bars
B) globular clusters
C) tidal streams
D) the formation of spirals from ellipticals
Q4) Why are the bars in barred spiral galaxies typically bright?
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Chapter 17: The Cosmic Web: the Large-Scale Structure of the Universe
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Q1) An astronomer discovers a region of space in which all the galaxies have peculiar motions away from a central point.This region is:
A) a void.
B) a filament.
C) a supercluster.
D) fully explained by the Hubble flow.
Q2) An astronomer would like to study a region of the Universe 100 Mpc across and 1 Gpc away from Earth,situated behind an obscuring cloud of dust,so he or she cannot directly measure light from the region.How could he or she measure the mass contained in this region?
Q3) What drives structure formation in our Universe?
A) turbulence
B) gravity
C) radiation
D) expansion
Q4) Which of the following astronomical objects has the largest look-back time?
A) a galaxy with z = 1
B) a supernova with z = 3
C) a quasar with z = 6
D) a gamma-ray burst with z = 8
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Chapter 18: Cosmology
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Q1) The classic Big Bang model attributes the initial moment of creation to:
A) high energy density.
B) baryogenesis.
C) quantum fluctuations.
D) nothing; it is not part of the theory.
Q2) Which of the following events occurred just before normal matter began assembling structure through gravity?
A) inflation
B) baryogenesis
C) recombination
D) nucleosynthesis
Q3) Suppose that an exotic quantum process keeps the Universe's temperature elevated during the first several years after the Big Bang.Which of the following would occur?
A) Nucleosynthesis would persist for longer.
B) Structure formation would be delayed.
C) Decoupling would occur sooner.
D) The Dark Ages would not occur.
Q4) How do scientists characterize the Universe before the Big Bang?
Q5) What are the three most important observational pillars for the Big Bang model?
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