Test
ASTR Review for Final #1 (All 5 Quizzes)
Preguntas del test (120)
1Which kind of light travels fastest in a vacuum?
- AX-Rays.
- BGamma Rays.
- CRadio waves.
- DInfrared.
- EThey all travel at the same speed.
2What kind of light has wavelengths between those of ultraviolet light and those of gamma waves?
- AInfrared.
- BMicrowaves.
- CRadio waves.
- DX-rays.
- EVisible light.
3How long does it take light from the Sun to reach us?
- A63,2000 years.
- B4.3 years.
- C8.3 minutes.
- D8.3 seconds.
- E4.3 seconds.
4The mass of a positron is the same as that of:
- Aa neutron.
- Ban electron.
- Ca proton.
- Da neutrino.
- Ea photon.
5In the second step of the proton-proton chain sequence of nuclear reactions occuring in the core of the Sun, a 2H nucleus and a 1H nucleus react. What is produced?
- AA 3^H nucleus.
- BA 3^He nucleus.
- CThree 1^H nuclei.
- DA 3^Li nucleus.
- EOnly energy; they annilihate each other.
6Which of the following processes in an atom is called 'excitation'?
- Awhen an atom loses an electron.
- Bwhen an atom fuses with another atom.
- Cwhen the nucleus of an atom splits into two or more parts.
- Dwhen an atom gains a neutron.
- Ewhen an electron in an atom gains energy and jumps to a higher energy level.
732 degrees Fahrenheit is equal to:
- A0 degrees Kelvin.
- B-273 degrees Kelvin.
- C-273 degrees Celsius.
- D273 degrees Celsius.
- E273 degrees Kelvin.
8In equation form, the inverse square law of light states:
- Aluminosity is proportional to T^4.
- Bbrightness is proportional to 1/D^2.
- Clambda(max) is proportional to 1/T.
- Dparallax is proportional to 1/D.
- Eluminosity is proportional to radius^2.
9Which portion of the Sun covers the largest total volume, in kilometers^3?
- Athe corona.
- Bthe convective zone.
- Cthe radiative zone.
- Dthe chromosphere.
- Ethe photosphere.
10As the frequency of light increases:
- Athe wavelength increases and the energy decreases.
- Bthe wavelength decreases and the energy decreases.
- Cthe wavelength increases and the energy increases.
- Dthe wavelength decreases and the energy increases.
- Ethe wavelength increases and the energy remains the same.
11When viewed carefully in visible light through a solar telescope, the Sun appears `speckled', with small (about 1000 km wide) variations in brightness covering the whole photosphere. These 'speckles' are the tops of convective cells. These features are called:
- AGranules.
- BCosmological spots.
- CIsotopes.
- DWien's spots.
- ESunspots.
12The peak of the spectrum of the photosphere of Betelgeuse lies in the:
- Aultraviolet.
- Binfrared.
- Cvisible.
- DX-ray.
- Eradio.
13What is a watt?
- AA unit of distance.
- BA unit of energy.
- CA unit of energy/time.
- DA unit of angle.
- EA sub-atomic particle.
14How are the distances to the nearest stars determined?
- AFrom their Doppler shift.
- BFrom their parallax.
- CFrom Wien's Law.
- DBy detecting neutrinos from them.
- EUsing Convection.
15A hot solid (like a burner on a stove) produces:
- Aa continuous spectrum.
- Ban emission line spectrum.
- Can absorption line spectrum.
- Dlight at a single wavelength.
- Elight at only a few specific wavelengths.
16Deuterium is:
- AAnti-matter.
- BHydrogen.
- CHelium.
- DPositrons.
- EParticles of light.
17A parsec is:
- A1/3600 of a degree.
- B3.26 light years.
- C8.3 light minutes.
- DThe distance from the Earth to the Sun.
- EThe distance from the Earth to the Moon.
18The strong force is:
- Athe force that keeps electrons bound to their atoms.
- Banother name for the gravitational force.
- Cthe force that is involved whenever an atom is ionized.
- Dthe force that keeps the nuclei of atoms together.
- Ethe force that keeps the Earth in orbit around the Sun.
19Kinetic energy is:
- Aenergy carried by light.
- Benergy produced when an electron and a positron collide.
- Cenergy of motion.
- Denergy stored for future use.
- Eall of the above.
- Aenergy carried by light.
20Why does it take so long for the energy produced in the core of the Sun to make its way out of the Sun?
- AThe convective cells in the convective layer move very slowly, transporting the energy very slowly.
- BThe speed of light is very low in the interior of the Sun because of the strong gravity.
- CPhotons do not travel very far without being absorbed, and when they are re-emitted, it is in a random direction.
- DMillions of small black holes throughout the Sun trap the energy.
- EThe nuclear reactions in the core produce mostly radio waves, which travel very slowly.
21A tenth magnitude star is:
- A2.5 times fainter than an eleventh magnitude star.
- B2.5 times brighter than an eleventh magnitude star.
- Cten times fainter than an eleventh magnitude star.
- Dten times brighter than an eleventh magnitude star.
- E100 times brighter than an eleventh magnitude star.
22Luminosity Class III stars are classified as:
- ASupergiant stars.
- BWhite dwarf stars.
- CMain sequence stars.
- DGiant stars.
- EEither giant or supergiant, depending upon the spectral class.
23Which of the following spectral types of stars has the hottest photospheric temperature?
- AA.
- BB.
- CF.
- DK.
- EO.
24Which of the following spectral types of stars has the strongest lines from ionized helium?
- AA.
- BK.
- CG.
- DM.
- EO.
25What is Henry Norris Russell known for?
- APioneering the use of plots of luminosity vs. temperature for stars.
- BRe-organizing the spectral sequence ABCDEF... to the sequence used today.
- CDetermining that the acceleration of an object is inversely proportional to its mass.
- DDetermining that the gravitational force between two objects is inversely proportional to the square of the distance apart.
- EDetermining that stars are made up of mostly hydrogen and helium.
26Spectral type A stars:
- Ahave very strong spectral lines of Titanium Oxide (TiO).
- Bhave very low B-V values (-0.3), compared to most stars.
- Chave stronger hydrogen lines than all other types of stars.
- Dhave stronger lines of ionized helium than all other types of stars.
- Ehave surface temperatures of about 30,000K.
27Which of the following is NOT a main sequence star?
- AA M2V star.
- BA M5I star.
- CA B2V star.
- DThe Sun.
- EA star fusing hydrogen to helium in its core.
28If a star is too far away to get its distance via stellar parallax, what is another method that can sometimes be used?
- AMeasure its proper motion.
- BMeasure its Doppler shift.
- CSpectroscopic parallax.
- DUse Wien's Law.
- ESearch for sunspots on the star.
29Solar maximum occurs approximately every:
- A5 minutes.
- B25 hours.
- C11 years.
- D250 years.
- E25,000 years.
30The magnetic polarity of the Sun switches approximately every:
- A5-10 minutes.
- B1 - 100 days.
- C6 months.
- D11 years.
- E26,000 years.
31Newton's Second Law, in mathematical form, states:
- AF = MA.
- Blambda(max) is proportional to 1/T.
- Cthe angular size is inversely proportional to the distance.
- DFv1 = Fv2.
- Ep is proportional to 1/D
32When the Moon moves directly in front of the Sun, but the Moon's angular size is too small to completely block the photosphere of the Sun, the eclipse that is produced is called:
- AA lunar eclipse.
- BA coronal eclipse.
- CA spicular eclipse.
- DA magnetodynamical eclipse.
- EAn annular eclipse.
33The Earth is 81 times more massive than the Moon. How does the gravitational force on the Earth due to the Moon compare with the gravitational force on the Moon due to the Earth?
- Athe gravitational force on the Earth due to the Moon is 81 times smaller.
- Bthe gravitational force on the Earth due to the Moon is 812 = 6561 times smaller.
- Cthe gravitational force on the Earth due to the Moon is square root of 81 = 9 times smaller.
- Dthe gravitational force on the Earth due to the Moon is 81 times larger.
- Ethe two forces are the same.
34An astronaut on the International Space Station orbiting Earth:
- Ahas a mass of 0 kg.
- Bhas a constant velocity.
- Cis not accelerating.
- Dis constantly accelerating.
- Ehas a mass equal to 1/6th of his/her mass on Earth.
35Newton's Law of Universal Gravitation can be written mathematically as:
- AF = GMv1Mv2/R^2
- BF = GMv1/Mv2R^2
- CF = GMv1Mv2/R
- DF = GMv1Mv2R^2
- EF = Mv1Mv2/GR^2
36Gas in which component of the Sun has a typical temperature of about a million degrees Kelvin?
- AThe core.
- BThe photosphere.
- CSunspots.
- DThe chromosphere.
- EThe corona.
37How long does an individual sunspot last?
- A5 - 10 minutes.
- B1 - 100 days.
- C11 years.
- D22 years.
- Emore than four hundred years. We still see the same sunspots that Galileo saw.
38Which of the following stars has the highest B - V?
- AA main sequence O star.
- BA white dwarf.
- CThe Sun.
- DAn A2V star.
- EBetelgeuse.
39Which type of star has temperatures between M stars and G stars?
- AF.
- BA.
- CB.
- DO.
- EK.
40Which type of star has the largest radius?
- AG2V.
- BM2I.
- CM2III.
- DM2V.
- EK2V.
41A white dwarf is:
- Athe burnt-out core of a star like the Sun, after the outer layers of the star have blown off and dispersed into interstellar space.
- Ba main sequence M star.
- Can object with a mass between 0.08 and 0.013 solar masses, that never became a star.
- Dan extrasolar planet.
- Eanother name for a brown dwarf.
42The Pleiades open cluster contains many B stars. Blue glowing nebulae surround the stars in this cluster. These are called:
- AHII Regions.
- BReflection Nebulae.
- CSupernova Remnants.
- DPlanetary Nebulae.
- EProtostars.
43The Pisgah Radio Telescope detects a strong 21 cm emission line from interstellar gas clouds. What produces this line?
- AAtomic hydrogen gas.
- BMolecular hydrogen.
- CCarbon monoxide.
- Dinterstellar dust.
- EIonized helium.
44Planetary nebulae are a type of interstellar cloud. What type?
- AMolecular clouds.
- BIonized clouds.
- CAtomic hydrogen clouds.
- DThe remnants of the explosions of supernovae.
- EDark clouds.
45The light curve of a star is a plot of what property of the star vs. time?
- Aproper motion vs. time.
- Bposition vs. time.
- Cvelocity vs. time.
- Dbrightness vs. time.
- Eangular size vs. time.
46The thermal spectrum (blackbody spectrum) of an interstellar dust grain peaks:
- Ain the ultraviolet.
- Bin the far-infrared.
- Cin the middle of the visible range.
- Din the X-ray.
- Eat 21 cm.
47The strong red emission line from hydrogen called the H-alpha line is strongest from what kind of interstellar clouds?
- Amolecular clouds.
- BHI clouds.
- CHII regions.
- Ddark clouds.
- Ereflection nebulae.
48When two stars in a binary system are both clearly seen from Earth as individual stars, and their orbital motion can be measured to confirm that they are gravitationally bound together, the pair is called a/an:
- AAstrometric binary.
- BVisual binary.
- CSpectroscopic binary.
- DOptical double.
- EEclipsing binary.
49What happens to the observed color of a star when it is behind an interstellar cloud?
- AIt appears bluer than it really is.
- BIt appears redder than it really is.
- CIts color does not change; it gets dimmer the same amount at all wavelengths.
- DThe optical color doesn't change, but all of the IR light from the star is absorbed by the cloud.
- EThe red and blue light gets dimmed similar amounts, while the yellow light is not affected by the cloud.
50Which of the following kinds of interstellar clouds are the hottest?
- AHII regions.
- BMolecular clouds.
- CAtomic clouds.
- DReflection nebulae.
- EDark clouds.
51Which type of main sequence star has the lowest mass?
- AA stars.
- BB stars.
- CF stars.
- DG stars.
- EM stars.
52In class, we did a demonstration in which a person sat on a stool and spun around. When he pulled in his arms, he spun faster. The reason this happens is because of:
- Amass conservation.
- Benergy conservation.
- Clinear momentum conservation.
- Dangular momentum conservation.
- Ethe center of mass relation.
- Amass conservation.
53What is the best type of telescope to use if you want to discover previously-unknown protostars?
- AX-ray.
- BUltraviolet.
- CVisible light.
- DInfrared.
- EGamma ray.
54The star Algol in Perseus (`The Ghoul' or `The Demon Star') was well-known to ancient astronomers, because of its peculiar nature. What unusual observational effect did ancient astronomers notice about this star?
- Aits large proper motion.
- Bits large parallax.
- Ca regular back-and-forth motion on the sky, indicating a companion.
- Devery few days, it gets much brighter for a short period.
- Eevery few days, it gets much dimmer for a short period.
55What is the difference between a planet like Jupiter and a brown dwarf?
- Athere is no difference: Jupiter is an example of a brown dwarf.
- Ba brown dwarf is the burned-out core of a star that has run out of nuclear fuel.
- Ca brown dwarf is a low luminosity main sequence star.
- Da brown dwarf may have 1H fusion going on in its core; Jupiter does not.
- Ea brown dwarf may have 2H fusion going on in its core; Jupiter does not.
56The dark cloud shaped like a horse's head, that is known as the Horsehead Nebula, is:
- AA reflection nebula.
- BAn HI cloud.
- CA molecular cloud.
- DAn HII region.
- EAn ionized gas cloud.
57Compared to an unobscured GV star, a GV star that lies behind an interstellar cloud will appear:
- Amore redshifted.
- Bbluer.
- Credder.
- Dhotter.
- Emore luminous.
58What luminosity class stars approximately obey the mass-luminosity relation described by the formula luminosity is proportional to mass to the fourth power?
- AI.
- BII.
- CIII.
- DIV.
- EV.
59Millimeter (microwave) telescopes detect the 2.6 millimeter emission lines from dense interstellar gas clouds. What produces this line?
- AAtomic hydrogen gas.
- BMolecular hydrogen.
- CCarbon monoxide.
- Dinterstellar dust.
- EIonized helium.
60When an interstellar cloud gravitationally collapses to form a protostar, what happens to the temperature of the gas in the core of the cloud?
- Ait remains constant until nuclear fusion starts, then it increases.
- Bthe temperature of the gas in the core decreases as the cloud collapses until nuclear fusion starts, then it increases.
- Cthe temperature of the gas in the core increases as the cloud collapses, even before nuclear fusion starts, then it increases further.
- Dthe temperature of the gas in the core decreases as the cloud collapses until nuclear fusion starts, then it decreases further as fusion cools the core down.
- Eno protostars have ever been found, so scientists have no idea what happens.
61In high mass main sequence stars, hydrogen is fusing to helium in the core. What is name of the main set of reactions by which this process occurs?
- AThe proton-proton chain.
- BThe CNO cycle.
- CThe triple alpha process.
- DThe brown dwarf process.
- EThe asymptotic giant branch process.
62If a white dwarf in a mass transfer binary system exceeds the Chandrasekhar limit, it becomes:
- AA nova.
- BA Type I supernova (a carbon-detonation supernova).
- CA Type II supernova (a core-collapse supernova).
- DA planetary nebula.
- EA black hole.
63Who discovered the first pulsar?
- AAnnie Jump Cannon.
- BHenry Norris Russell.
- CJocelyn Bell.
- DCecilia Payne-Gaposchkin.
- EEjnar Hertzsprung.
64Three solar masses is:
- AThe upper mass limit to the mass of a neutron star.
- BThe upper mass limit to the mass of a white dwarf.
- CThe upper mass limit to the mass of a brown dwarf.
- DThe approximate mass of a main sequence M star.
- EThe approximate mass of a main sequence O star.
65Which of the following objects is closest in diameter to the Earth?
- AA main sequence M star.
- BA main sequence O star.
- CA neutron star.
- DA white dwarf.
- EBetelgeuse.
- AA main sequence M star.
66The very regular `pulses' of radio light we see from some neutron stars are due to:
- Athe star pulsating in size.
- Ba companion dumping gas onto the neutron star, causing flare-ups of nuclear reactions.
- Ca companion periodically eclipsing the neutron star.
- Das the pulsar spins, a beam of light from the magnetic poles of the neutron star sweeps across the Earth.
- Ean extragalactic civilization.
67When a 1 solar mass star leaves the main sequence and moves up the red giant branch of the H-R diagram for the first time, what is occuring in the interior of the star?
- Ano nuclear reactions are occuring anywhere in its interior.
- Bhydrogen fusion in the core.
- Chelium fusion in the core.
- Dcarbon fusion in the core.
- Eno reactions in the core; hydrogen fusion in a shell surrounding the core.
68Why doesn't a white dwarf contract under the force of its own gravity?
- ABecause carbon fusion is occuring in its core.
- BBecause the CNO process is occuring in its core.
- CBecause the triple alpha process is occuring in its core.
- Dit is held up against gravity by electron degeneracy pressure.
- Eit is held up against gravity by neutron degeneracy pressure.
69Which of the following statements is true about the lifetimes of main sequence stars?
- ALower luminosity main sequence stars live longer than higher luminosity main sequence stars.
- BMain sequence A stars live longer than main sequence K stars.
- CHot main sequence stars live longer than cool main sequence stars.
- DThe greater the mass of a star, the longer its main sequence lifetime.
- EAll main sequence A stars ever formed are still main sequence A stars.
70Approximately how many years from now will the Sun runs out of hydrogen in its core?
- A1 million years.
- B5 million years.
- C5 billion years.
- D5 trillion years.
- Efive hundred trillion years.
71A particular star cluster is observed to have a full main sequence, extending from MV stars to OV stars. Approximately how old is this cluster?
- ALess than a few million years old.
- B100 million years old.
- C1 billion years old.
- D10 billion years old.
- E1 trillion years old.
72Iron is produced:
- AIn the core of main sequence stars.
- BIn the cores of red giant stars.
- CIn white dwarf stars.
- DIn the last stages of life of a 1 solar mass star.
- EIn the cores of massive stars, just before a supernova.
73What is the heaviest chemical element that will ever be created in large amounts in the core of the Sun?
- AIron.
- BUranium.
- CSilicon.
- DTitanium.
- ECarbon.
74From lowest mass to highest mass, what is the correct order of the following objects or types of objects?
- ANeutron stars, brown dwarfs, MV stars, the Sun.
- BBrown dwarfs, MV stars, the Sun, Neutron stars.
- CBrown dwarfs, neutron stars, MV stars, the Sun.
- DThe Sun, brown dwarfs, neutron stars, MV stars.
- EBrown dwarfs, the Sun, neutron stars, MV stars.
75The triple alpha process is:
- AAnother name for the proton-proton chain.
- BThe process that produces uranium and other high mass elements.
- CWhen three helium-4 nuclei fuse to form carbon.
- DThe formation of neutrons out of protons and electrons.
- EWhen three stars combine to form a more massive star.
76Synchrotron radiation is produced by:
- Aa hot sold object, like the filament in a light bulb.
- Belectrons in atoms jumping from lower energy levels to higher energy levels.
- Celectrons in atoms jumping from higher energy levels to lower energy levels.
- Donly supernova.
- Eaccelerated charged particles.
77Which of the following chemical elements is only produced during a supernova explosion?
- APlutonium.
- BSilicon.
- CIron.
- DMagnesium.
- EOxygen.
78Which of the following stars will likely eventually explode as a supernova?
- AThe Sun.
- BThe MV star Proxima Cen.
- CBetelgeuse.
- DA 0.5 solar mass AGB star.
- EAll of the above.
79Over the course of its lifetime, the Sun will go through all of the following stages except one. Which is the exception?
- Awhite dwarf.
- BAGB star.
- Cneutron star.
- Dhorizontal branch star.
- Ered giant.
80Approximately how frequently does a supernova occur in the Milky Way Galaxy?
- Aonce every million years.
- Bonce every 200 years.
- Conce per year.
- Dabout 100 supernova occur in the Milky Way per year.
- Eabout a million supernova occur in the Milky Way per year.
81On the Hubble Tuning Fork diagram, galaxies that sit between the ellipticals and the spiral galaxies are called:
- AIrregular galaxies.
- BS0 galaxies.
- CSc galaxies.
- DSb galaxies.
- ESBd galaxies.
82Most of the following types of objects are mainly found in the disk of the Milky Way. Which of the following is the exception, also being seen regularly in the bulge and halo?
- Aopen clusters.
- BHII regions.
- CSN Type II.
- DO and B main sequence stars.
- Eplanetary nebulae.
83 What is the mass of a photon of light?
- A1/2000th the mass of a proton.
- B1/2000th the mass of an electron.
- CIt depends upon the wavelength: the longer the wavelength, the larger the mass.
- DIt depends upon the wavelength: the longer the wavelength, the smaller the mass.
- EZero.
84The Schwarzchild Radius is defined as:
- AThe radius of the stellar disk of the Milky Way.
- BThe point between two stars in a binary star system such that the gravitational force from the two stars is equal.
- CThe maximum possible radius of a white dwarf.
- DThe maximum possible radius of a neutron star.
- EThe radius of the event horizon of a black hole.
85What is the main difference between E0 and E7 galaxies?
- AE0 galaxies are much larger, in physical diameter.
- BE7 galaxies are flatter in appearance, while E0 galaxies are round.
- CE7 galaxies have spiral arms; E0 galaxies do not.
- DE0 galaxies have bars in the center; E7 galaxies do not.
- EE0 galaxies have tightly wrapped spiral arms; E7 galaxies have loosely wrapped spiral arms.
86An SBc galaxy:
- Ahas a large bulge and tightly wrapped spiral arms.
- Bhas a large bulge and loosely wrapped spiral arms.
- Chas a large bulge and a bar.
- Dhas a small bulge and a bar.
- Eis a spheroidal ball of stars which is approximately round in appearance on the sky.
87Who was the first person to classify spiral and elliptical galaxies into sub-types according to their appearance?
- AEdwin Hubble.
- BHenrietta Leavitt.
- CHarlow Shapley.
- DWilliam Herschel.
- ERobert Trumpler.
88Who was the first person to conclude that the Sun is NOT in the center of the Milky Way?
- AHenrietta Leavitt.
- BHarlow Shapley.
- CEdwin Hubble.
- DWilliam Herschel.
- ERobert Trumpler.
89Henrietta Leavitt discovered:
- ADiffuse interstellar dust in the Milky Way.
- BSagittarius A*.
- CThe Cepheid Period-Luminosity Relation.
- DCepheid Variables in the Andromeda Galaxy.
- EThe first pulsar.
90On the H-R Diagram, Cepheid Variables sit:
- AOn the bottom of the Main Sequence.
- BOn the top of the Main Sequence.
- CBelow and to the left of the Main Sequence.
- DOn the far right: they are M stars.
- ENear the middle of the diagram, above the Main Sequence.
91In the Milky Way, most of the interstellar gas is:
- AIn the spiral arms.
- BIn the bulge.
- CIn the halo.
- DIn the disk.
- EEvenly spread between the bulge, the disk, and the halo.
92What object lies in the center of the Milky Way galaxy?
- ACygnus X-1.
- Bdelta Cephei.
- CThe Sun.
- DSirius.
- ESagittarius A*.
- ACygnus X-1.
93The first conclusive evidence that light is affected by gravity was obtained:
- AAbout three years ago, at the CERN laboratory in Switzerland.
- BIn 1919, during a total solar eclipse.
- CIn the 1960's, with a radio telescope.
- DAbout 10 years ago, with the Hubble Telescope.
- ENo evidence has been found yet; it has just been theorized.
94In the Milky Way, open clusters are found:
- AMainly in the disk.
- BMainly in the bulge.
- CMainly in the halo.
- DEvenly spread in the disk, bulge, and halo.
- EIn both the bulge and halo, but usually not the disk.
95William Herschel:
- ADiscovered Cepheid variables in the Andromeda Galaxy.
- BDiscovered the Period-Luminosity relation for Cepheid variable stars.
- CMade the first 3-dimensional map of the Milky Way.
- DClassified galaxies according to the bulge/disk ratio and the tightness of wrapping of the spiral arms.
- EWas the first person to conclude that the Sun is not in the center of the Milky Way.
96By tradition, plots of the circular orbital velocities of stars and gas in the disks of spiral galaxies vs. the distance from the center are called:
- ASpin diagrams.
- BHubble diagrams.
- CRotation curves.
- DLight curves.
- ETidal diagrams.
97RR Lyrae stars are:
- ABrown dwarfs.
- BWhite dwarfs.
- CVariable stars.
- DEclipsing binary stars.
- EProtostars.
98What did Friedrich Bessel detect for the first time in 1838?
- ABrown dwarfs.
- BCepheid variables in the Andromeda Galaxy.
- CAn eclipsing binary star.
- DA pulsar.
- EStellar parallax.
99Cygnus X-1 is most likely:
- AAn eclipsing binary star.
- BA Cepheid variable star.
- CA neutron star.
- DA black hole.
- EAn RR Lyrae star.
100A black hole with the same mass as Jupiter has an event horizon with a radius of about 3 meters. The Sun has a mass about 1000 times that of Jupiter. Therefore, the radius of the event horizon of a 1 solar mass black hole is:
- A3 kilometers.
- B3 centimeters.
- C3^3 = 27 meters.
- D3 million meters = 3000 kilometers.
- E1/3 meter.
101What is the second-to-top step on the Cosmological Distance Ladder?
- AHubble's Law.
- BSupernovae Type I.
- CCepheid Variables.
- DSpectroscopic Parallax.
- EStellar Parallax.
102The Local Group is in the center of:
- AThe Coma Cluster.
- BThe Great Wall.
- CThe Virgo Cluster.
- DThe Local Supercluster.
- ENone of the above.
103The Magellanic Clouds are in the:
- AVirgo Cluster.
- BThe Great Wall.
- CThe Coma Cluster.
- DThe Local Group.
- EThe Milky Way.
104Double-Lobed Radio Galaxies are mostly:
- AGiant Elliptical galaxies.
- BSpiral galaxies.
- CBarred spiral galaxies.
- DBoth barred and unbarred spiral galaxies.
- EIrregular galaxies.
105Quasars are:
- AOnly found in the Milky Way.
- BOnly found in the Local Group.
- COnly found in the Local Supercluster.
- DSimilar in luminosity to Sagittarius A*.
- ELess frequent in the present than in the past.
106The Sun was first detected in the radio by:
- AKarl Jansky.
- BEdwin Hubble.
- CJocelyn Bell.
- DAllan Sandage.
- ERadar operators in World War II.
107Hubble's constant is approximately 75 (km/s)/Mpc. If a galaxy is moving away from us at a speed of 7500 km/s, what is its approximate distance?
- A7500 X 75 = 562,500 Mpc.
- B75/7500 = 0.01 Mpc.
- C7500 / 75 = 100 Mpc.
- D7500 X 75 X 75 = 42,188,000 Mpc
- E7500 / 752 = 1.33 Mpc.
108Hubble's Law is a useful way to determine astronomical distances, but only for some objects. For which of these objects would it work to get an approximate distance?
- AA globular cluster in the halo of the Milky Way.
- BThe stars in the belt of Orion.
- CSagittarius A*.
- DThe Andromeda Galaxy.
- EThe Great Wall.
109The emission lines seen in the optical spectra of quasars were initially unidentified. Who first identified these lines, and showed that they are just lines of ordinary elements, but very redshifted?
- AEdwin Hubble.
- BJocelyn Bell.
- CMaarten Schmidt.
- DHarlow Shapley.
- EAllan Sandage.
110The Cartwheel galaxy is:
- Aa giant elliptical galaxy in the center of the Coma cluster.
- Ba spiral galaxy very similar to the Milky Way.
- Ca dwarf irregular galaxy in orbit around the Milky Way.
- Da ring galaxy.
- Ea dwarf elliptical galaxy in the Local Group.
111A Universe that will collapse back upon itself in a `Big Crunch' is called a/an:
- AFlat Universe.
- BClosed Universe.
- COpen Universe.
- DInfinite Universe.
- EUniverse with a density equal to the the critical density.
112The Cosmological Constant was initially introduced into the equations governing the evolution of the Universe by:
- AEdwin Hubble.
- BHenrietta Leavitt.
- CHarlow Shapley.
- DAlbert Einstein.
- EAllan Sandage.
113Which of the following objects is the most luminous?
- AA quasar.
- BA Cepheid variable star.
- CSagittarius A*.
- DThe nucleus of a Seyfert galaxy.
- EA pulsar.
114The Zone of Avoidance is:
- AA large spherical 'void' containing very few galaxies, as seen in 'slice of the Universe' plots.
- BThe large volume of nearby space which does not contain any quasars.
- CThe plane of the Milky Way, whose dust blocks light from distant galaxies.
- DAll parts of the Universe outside of the Local Supercluster.
- EParts of the Universe too far away for us to see, since light has not had time yet to reach us.
115Observations of Supernovae Type I in very distant galaxies provided the first evidence for:
- ADark Energy.
- BDark Matter.
- CA closed Universe.
- DThe theory that the Universe will end in a `Big Crunch'.
- EThe Great Wall.
11616. The diagram to the right is a plot of time (on the x axis) vs. the distance between any two galaxies in the Universe (on the y axis) for three different Universes: Universe A, Universe B, and Universe C. Which of the three Universes in the above diagram has the highest density of matter?
- AUniverse A.
- BUniverse B.
- CUniverse C.
- DUniverse A and B are the same.
- EAll three Universes are the same.
117What is the top step on the Cosmological Distance Ladder?
- AHubble's Law.
- BSupernovae Type I.
- CCepheid Variables.
- DSpectroscopic Parallax.
- EStellar Parallax.
118The difference between a double-lobed radio galaxy and a core-halo radio galaxy is:
- ADouble-lobed radio galaxies are ellipticals; core-halo radio galaxies are spirals.
- BDouble-lobed radio galaxies are spirals; core-halo radio galaxies are ellipticals.
- CDouble-lobed radio galaxies are much more luminous than core-halo radio galaxies.
- DDouble-lobed radio galaxies are much less luminous than core-halo radio galaxies.
- EThe difference is just due to our viewing location; physically, they are the same kind of objects.
119The Great Wall is:
- AAnother name for the Local Supercluster.
- BA large 'wall' of galaxies centered on the Local Group.
- CA large `wall' of galaxies about 100 Mpc away, containing the Coma cluster.
- DThe part of the Universe hidden in visible light by the dust in the plane of the Milky Way.
- EThe group of galaxies we live in.
120What kind of galaxies are NOT found in the Local Group, but ARE seen in the Virgo Cluster?
- Adwarf ellipticals.
- Bgiant ellipticals.
- Cspiral galaxies.
- Dirregular galaxies.
- Eall of the above are seen in both the Local Group and the Virgo Cluster.
Información
- Descripción
- Test sobre ASTR Review for Final #1 (All 5 Quizzes), creado por Taylor Campbell el 24/04/2015.
- Autor
- Taylor Campbell
- Idioma
- English
- Visitas
- 40
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