Astronomy - Chapter 13 Test

8/10/2019 Astronomy - Chapter 13 Test

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CHAPTER 13: The Deaths of Stars

1.Low-mass stars can undergo two evolutionary phases called red-giant phases. What is

the difference between them?

A) In the first the primary production of energy is from hydrogen burning in the core.In the second the primary production of energy is from helium burning in the core.

!) In the first the primary production of energy is from helium burning in the core. In

the second the primary production of energy is from helium burning in a shellaround the core.

") In the first the star#s trac$ on the %ert&sprung-'ussell diagram lies along the red-

giant branch. In the second the trac$ lies along the hori&ontal branch.() (uring the first red-giant phase the star moves up and to the right along the red-

giant branch. (uring the second red-giant phase the star#s trac$ is down and to the

left along the same red-giant branch.

Ans !*ection 1+-, and 1-1

+.What are the main products of helium nuclear fusion in red-giant stars?

A) %ydrogen nuclei by nuclear fission!) nergy from the complete transformation of the mass of helium to energy

") Iron nuclei() "arbon and o/ygen nuclei

Ans (

*ection 1-1

.%elium nuclear reactions 0helium fusion) produce primarily

A) carbon and o/ygen. !) carbon and silicon. ") iron. () o/ygen and neon.

Ans A*ection 1-1

.2uclear fusion reactions of helium produce primarilyA) nitrogen and neon nuclei. ") beryllium and lithium nuclei.

!) iron nuclei. () carbon and o/ygen nuclei.

Ans (*ection 1-1

3.4he nuclear process in which helium fusion occurs in the deep interiors of red giant stars

producesA) iron nuclei.

!) carbon and o/ygen nuclei.

") hydrogen nuclei by the splitting of helium nuclei.() pure energy from the nuclear mass.

Ans !

*ection 1-1

5.4he structure of the deep interior of a low-mass star near the end of its life is

A) a carbon-o/ygen core a shell around it where helium nuclei are undergoing fusion

and a surrounding shell of hydrogen.!) an inactive hydrogen core and a helium shell undergoing nuclear fusion surrounded

by a carbon-o/ygen shell.

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") a turbulent mi/ture of hydrogen helium carbon and o/ygen in which only helium

continues to undergo nuclear fusion.

() a helium core surrounded by a thin hydrogen shell undergoing nuclear fusion withvery small concentrations of heavier nuclei.

Ans A

*ection 1-1

6.(uring which phase of a low-mass star#s life does helium shell fusion occur?

A) 7ain-se8uence ") 9irst red-giant phase!) Asymptotic giant-branch () %ori&ontal-branch

Ans !

*ection 1-1

:.%elium nuclear reactions ta$e place in a shell around the core of a low-mass star during

its

A) hori&ontal-branch phase. ") main-se8uence phase.

!) first red-giant phase. () asymptotic giant-branch phase.Ans (

*ection 1-1

,.A star on the asymptotic giant branch 0A;!) is

A) a cool main-se8uence star. ") a star in its first red-giant phase.!) a blue supergiant. () a red supergiant.

Ans (

*ection 1-1

1


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asymptotic giant-branch 0A;!) phase of its life?

A) 1< times brighter ") 4wice as bright

!) 1


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!) 9usion of o/ygen nuclei to form sulfur

") 9usion of helium nuclei to form carbon and o/ygen

() 9usion of hydrogen nuclei to form heliumAns "

*ection 1-1

1:.What happens to the surface of a low-mass star after the helium core and shell fusion

stages are completed?

A) It stabili&es at the si&e of a red giant star radiation pressure from below balancinggravity from the core and will slowly cool for the rest of its life.

!) It is spun off into space to ma$e a spiral structure $nown as a spiral gala/y.

") It is propelled slowly away from the core to form a planetary nebula.

() It contracts bac$ onto the core and becomes hot enough to undergo furtherhydrogen fusion leading to a very hot and active white dwarf star.

Ans "

*ection 1-1

1,.In astronomical terms planetary nebulae are

A) very long-lived obCects having been in e/istence since Cust after the !ig !ang atthe beginning of the universe.

!) relatively short-lived e/isting around the central white dwarf star for millions of

years before slowly spreading into space.") relatively long-lived since they form when the original stars form and remain as

slowly rotating shells for the whole of their lifetimes of several billion years.

() very short-lived with lifetimes of about 3


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() the nebula caused by the supernova e/plosion of a massive star.

Ans !

*ection 1-1

++.A planetary nebula is

A) a shell of eCected gases.!) the formation stages of planets around stars.

") a gas cloud surrounding a planet after its formation.

() the spherical cloud of gas produced by a supernova e/plosion.Ans A

*ection 1-1

+.A planetary nebula isA) a gas shell the atmosphere of a red giant star slowly e/panding away from the core

of the star.

!) a contracting spherical cloud of gas surrounding a newly formed star in which

planets are forming.") the nebula caused by the supernova e/plosion of a massive star.

() a dis$-shaped nebula of dust and gas rotating around a relatively young star withinwhich planets will eventually form.

Ans A

*ection 1-1

+.A planetary nebula is

A) a cloud of gas surrounding a very young star in which planets are e/pected to form.

!) the spherical rapidly e/panding cloud of gas produced by a supernova e/plosion.") the gas cloud surrounding a planet after its formation.

() a shell of gases eCected from the surface of a red giant star.

Ans (*ection 1-1

+3.4he event that follows the asymptotic giant-branch 0A;!) phase in the life of a low-massstar is

A) the eCection of a planetary nebula.

!) core collapse and a supernova e/plosion.

") helium flash and the start of helium fusion in the core.() the onset of hydrogen fusion in the core.

Ans A

*ection 1-1

+5.A planetary nebula is created

A) over several hundred years during mass transfer in a close binary star system.!) over a few thousand years or more in a slow e/pansion away from a low-mass star

driven by a series of thermal pulses from helium fusion.

") in hours or less during the e/plosion of a massive star.

() in seconds during the helium flash in a low-mass star.

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Ans !

*ection 1-1

+6.4he light from the e/panding shell of gas in a planetary nebula consists of

A) bright emission lines of hydrogen carbon nitrogen and other elements.

!) thermal 0blac$body) radiation with pea$ emission in the infrared.") the light of the central white dwarf star reflected and scattered by dust and gas in

the shell.

() thermal 0blac$body) radiation with pea$ emission in the ultraviolet.Ans A

*ection 1-1

+:.What physical process provides the energy for the eCection of a planetary nebula from alow-mass star?

A) 4ransfer of hydrogen-rich material onto the surface of a white dwarf from its

companion in a binary star system

!) %elium shell flashes in the helium fusion shell") "ore collapse and the ensuing shoc$ wave

() "ollision with another star Ans !

*ection 1-1

+,.4he diameter of a typical planetary nebula after 1


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year over the ;ala/y as a whole?

A) Aabout 3


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Ans (

*ection 1-+

,.4he final remnant of the evolution of a red giant star that has eCected a planetary nebula is

A) a protostar. !) a blue supergiant. ") a white dwarf star. () a supernova.

Ans "*ection 1-+


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*ection 1-+

.At which phase of its evolutionary life is a white dwarf star?A) ost-supernova phase the central remnant of the e/plosion

!) Kust at main se8uence or hydrogen-fusion phase

") Eery late for small-mass stars in the dying phase() In its early phases soon after formation

Ans "

*ection 1-+

3.A white dwarf star is at what stage of its evolution?

A) rotostar phase Cust after formation beginning to generate energy by nuclear

fusion!) 7ain-se8uence phase @middle-aged generating energy by fusion of hydrogen to

helium

") ost-supernova stage after the e/plosion of a star

() Eery late phase of evolution no longer generating energyAns (

*ection 1-+

5.Bur *un will end its life by becoming

A) a molecular cloud. !) a blac$ hole. ") a white dwarf. () a pulsar.Ans "

*ection 1-+

6.A white dwarf star is about the same si&e asA) the *un. !) the arth. ") the total solar system. () a maCor city.

Ans !

*ection 1-+

:.4he energy generation process inside a white dwarf star is

A) the combining of protons and electrons to form neutrons within its core.!) hydrogen fusion.

") none/istentMa white dwarf star is simply cooling by radiating its original heat.

() the helium flashMvery efficient and rapid helium fusion.

Ans "*ection 1-+

,.%ow does a white dwarf generate its energy?A) It no longer generates energy but is slowly cooling as it radiates away its heat.

!) 2uclear fusion of hydrogen into helium is producing energy within its core.

") 2uclear fission of heavy elements in the central core is releasing energy.() ;ravitational potential energy is released as the star slowly contracts.

Ans A

*ection 1-+

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3


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than

A) +3 solar masses. ") 1. solar masses.

!) : solar masses. () solar masses.Ans !

*ection 1-+

35.Bne peculiar feature of the evolution of a white dwarf star of a particular mass is that

A) it spins as it shrin$s until it is rotationally flattened into a dis$.

!) it heats up as it shrin$s because of the release of gravitational energy ending up asa very hot but very small star.

") it slowly shrin$s and cools to a critical radius then collapses to become a blac$

hole.

() its si&e or radius remains constant as it cools and dies.Ans (

*ection 1-+

36.As a white dwarf evolves the direction of its motion on the %er&sprung-'ussell diagramis from upper left to lower right which means that

A) its si&e or radius slowly increases as it cools until it ends up as a red giant star.!) its si&e or radius remains constant as it cools and becomes less luminous.

") it heats up as it shrin$s because of the release of gravitational energy ending up as

a very hot but very small star.() it shrin$s as it cools eventually becoming a cold blac$ hole in space.

Ans !

*ection 1-+

3:.A white dwarf star as it evolves undergoes which of the following changes?

A) Its temperature remains constant but its radius and therefore its luminosity

decrease.!) Luminosity and si&e decrease while its temperature remains constant.

") It shrin$s in si&e the resulting release of gravitational energy $eeping both

luminosity and temperature constant.() Luminosity and temperature decrease while its si&e remains constant.

Ans (

*ection 1-+

3,.4here is a mass limit for a star in the white-dwarf phase the "handrasa$har limit beyond

which the electron-degeneracy pressure can no longer support the star against its own

gravity. 4his mass limit isA)


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gravity?

A) 'ed giants !) !lac$ holes ") 2eutron stars () White dwarfs

Ans (*ection 1-+

51.4he star *irius 0"anis 7aCoris) is actually a binary star in which the brighter moremassive star 0*irius A) is an A-type main-se8uence star and the fainter less-massive star

0*irius !) is a white dwarf. %ow is this system most li$ely to have formed?

A) *irius A formed as a single star and later captured a passing white dwarf.!) *irius ! formed first and evolved to become a white dwarf> capture of gas and dust

from interstellar clouds then resulted in the formation of *irius A.

") *irius ! was initially more massive than *irius A and evolved faster> it then became

less massive due to mass loss to space and mass transfer to *irius A.() *irius A was always the more massive of the two and became a red giant> then mass

transfer to *irius ! accelerated the evolution of *irius ! and caused it to become a

white dwarf.

Ans "*ection 1+-1 and 1-+

5+.Are crystalline stars or crystalline remnants of stars possible> why or why not?

A) 2o stars and stellar remnants are too hot to crystalli&e.

!) es they are the li$ely outcome of the cooling of a white dwarf.") 2o the forces needed to crystalli&e a star would actually cause the star to collapse

gravitationally into a blac$ hole.

() es they are the li$ely outcome of the creation of iron in the core of a massive star.

Ans !*ection 1-+

5.4he nova phenomenon an occasional and sometimes repeated intense brightening of astar by a factor of about 1


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!) material falling into a blac$ hole and being condensed to the point where a

thermonuclear e/plosion is produced.

") the complete disintegration of a massive star due to a runaway thermonucleare/plosion in the star#s interior.

() matter from a companion star falling onto a white dwarf in a close binary system

eventually causing a nuclear e/plosion on the dwarf#s surface.Ans (

*ection 1-

55.A nova is a sudden brightening of a star that occurs when

A) material is transferred onto the surface of a white dwarf from a companion star in a

binary system then subse8uently blasted into space by a runaway thermonuclear

e/plosion 0leaving the white dwarf intact to repeat the process).!) material from a companion star is transferred onto the surface of a white dwarf star

in a binary system after which runaway carbon-fusion reactions cause the entire

white dwarf to be destroyed in an e/plosion.

") the electron-degenerate iron core of a massive star collapses after its mass becomesgreater than the "handrase$har mass limit.

() material is transferred onto a neutron star from a companion star in a binarysystem causing the neutron star to collapse into a blac$ hole.

Ans A

*ection 1-

56.A nova is an e/plosion involving a white dwarf. "an a white dwarf become a nova more

than once> why or why not?

A) 2o because the white dwarf#s magnetic field is eliminated in the e/plosion!) es if the temperature is high enough for recurrent helium flashes in the white

dwarf#s core

") es if it continues to receive matter from a companion star() 2o because the white dwarf is destroyed in the e/plosion

Ans "

*ection 1-

5:.*uppose you see a news announcement that astronomers have discovered a nova in a

distant gala/y. What do you immediately $now about the star that gave rise to this nova?

A) It is a white dwarf in a binary system in which the other star fills its 'oche lobe.!) It is a neutron star in a binary system in which the other is star a white dwarf.

") It is a neutron star in a binary system in which the other star fills its 'oche lobe.

() It is a blac$ hole in a binary system in which the other star fills its 'oche lobe.Ans A

*ection 1-

5,."arbon fusion in massive stars combines helium and carbon to produce o/ygen. 4his is

followed by o/ygen fusion in which o/ygen is burned to produce sulfur. Why is a higher

temperature re8uired for o/ygen fusion than for carbon fusion?

A) !ecause of e/tensive mass loss between the carbon-fusion and o/ygen-fusion

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stages higher temperatures are re8uired for nuclear reactions in the relatively

rarified stars in which o/ygen fusion ta$es place.

!) Larger nuclei li$e o/ygen have more protons and are therefore repelled morestrongly from other nuclei. 4hus faster speeds 0at higher temperatures) are

re8uired to bring these nuclei together than are re8uired for smaller nuclei.

") 9ree neutrons are re8uired in greater numbers to enable the o/ygen reaction andthis re8uires higher temperatures to produce them.

() 4he enormous neutrino flu/ in the core of a massive star inhibits nuclear reactions.

%igh temperatures are necessary to force these neutrinos out of the star so nuclearreactions can proceed.

Ans !

*ection 1-

6


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*ection 1- and 4able 1-1

63.ach successive stage of core nuclear reactions in a massive star lasts for considerablyless time than the previous stage 0e.g. for a +3-solar-mass star carbon fusion lasts for

5


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6,.4hermonuclear reactions release energy because

A) the product 0ash) nucleus contains fewer protons than the original 0fuel) nucleussince these protons have been converted into energy.

!) the product 0ash) nucleus is more tightly bound than the original 0fuel) nucleus.

") the product 0ash) nucleus is less tightly bound than the original 0fuel) nucleus.() the product 0ash) nucleus is moving faster than the original 0fuel) nucleus and this

e/cess $inetic energy shows up as heat.

Ans !*ection 1-3

:


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") mit copious amounts of neutrinos

() Cect its outer layers and become a white dwarf

Ans (*ection 1-3

:.After the material in the core of a massive star has been converted to iron bythermonuclear reactions further energy can be released to heat the core B2L by

A) gravitational contraction.

!) nuclear fission or splitting of nuclei.") the absorption of neutrinos.

() thermonuclear fusion of iron into heavier elements.

Ans A

*ection 1-3

:3.9rom the start of collapse to the attainment of nuclear density the process of core

collapse at the end of the life of a massive star ta$es a time of about

A) 1+


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*ection 1-3

:,.(uring its life a massive star creates heavier and heavier elements in its core throughthermonuclear fusion leading up to silicon and iron. What is the fate of the iron that is

created?

A) 4he nuclei are split apart by neutron bombardment creating lighter elements suchas carbon o/ygen and neon.

!) It is loc$ed up inside the star forever.

") It is destroyed by later thermonuclear fusion reactions in the core that create evenheavier elements such as lead gold and uranium.

() It is torn apart by high-energy photons at the end of the star#s life.

Ans (

*ection 1-3

,


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,.What is the source of most of the heavy elements on the arth and in our own bodies?

A) 4hermonuclear fusion reactions in the cores of massive stars before the supernova

phase!) /plosive nucleosynthesis during supernova e/plosions of massive stars

") "osmic ray interactions with hydrogen and helium nuclei in interstellar clouds

() 2uclear reactions during the formation of the universe 0the !ig !ang)Ans !

*ection 1-3

,3.4he core-collapse phase at the end of the life of a massive star is triggered when

A) the helium flash and thermal pulses have e/pelled the star#s envelope.

!) the density reaches the threshold for electron degeneracy pressure to become

important.") nuclear fusion has produced a significant amount of iron in its core.

() the core becomes as dense as an atomic nucleus.

Ans "

*ection 1-3

,5.hotodisintegration the fissioning of iron nuclei into helium nuclei due to high energygamma radiation occurs only at the very end of the life of a massive star. Why can this

not occur earlier? ach of the following answers is correct except one. Which answer is

incorrect?A) Iron nuclei do not e/ist in anything but trace amounts before this stage.

!) ;amma radiation of sufficient energy is not produced before this stage.

") 4he fissioning of an iron nucleus re8uires energy and the energy-rich environment

that allows this to happen does not e/ist before this stage.() Dnder the conditions of the previous stages of evolution iron 0+59e) disappears as

8uic$ly as it is formed by combining with helium 0%e) to produce &inc 0


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") 1


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Ans (

*ection 1-6

1


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*ection 1-:

11.4he detection of neutrinos from supernova *2 1,:6A occurred three hours before thedetection of the burst of visible light. What caused this time lag?

A) 4he result proved that neutrinos travel faster in vacuum than light does.

!) 4he space between the supernova and the arth is not a perfect vacuum but is filledwith very rarified gas and dust. 4his impedes the passage of light 0very slightly)

but not of neutrinos.

") 4he neutrinos and the light were produced at the same time but the light bouncedbac$ and forth between the core and the outer layers several times before these

layers e/panded to the point that they became transparent.

() 4he neutrinos were produced earlier 0when the core collapsed) and the light was

produced hours later 0when the shoc$ wave reached the outer layers).Ans (

*ection 1-:

113."eren$ov radiation that was used to detect neutrinos from supernova *2 1,:6A wasproduced by

A) neutrons eCected from nuclei by the neutrinos.!) positive electrons 0positrons) traveling faster than the speed of light in water.

") nuclear fusion produced in the detector by neutrinos.

() electrons and antielectrons 0positrons) colliding and annihilating.Ans !

*ection 1


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11,.A 4ype II supernova is

A) the collapse of a blue supergiant star to form a blac$ hole.!) the e/plosion of a white dwarf in a binary star system after mass has been

transferred onto it from its companion.

") the e/plosion of a red giant star as a result of a helium flash in the core.() the e/plosion of a massive star after silicon fusion has produced a core of iron

nuclei.

Ans (*ection 1-,

1+


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1+."an a white dwarf e/plode?

A) es but only if another star collides with it> stars are so far apart in space that thisis unli$ely ever to have happened in our ;ala/y.

!) es but only if it is in a binary star system.

") es but only if nuclear reactions in the white dwarf core reach the stage of siliconfusion producing iron.

() 2o> white dwarfs are held up by electron-degeneracy pressure and this

configuration is stable against collapse or e/plosion.Ans !

*ection 1-,

1+.4he estimated rate at which supernova e/plosions occur in a spiral gala/y such as ourown is

A) about once every 3 years. ") about once every


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Ans !

*ection 1-,

1+6.4he e/plosion of a supernova appears to leave behind

A) a rapidly e/panding shell of gas and a central neutron star.

!) a rapidly rotating shell of gas dust and radiation but no central obCect.") a rapidly e/panding shell of gas and a compact white dwarf star at its center.

() nothing> the e/plosion changes all the matter completely into energy which then

radiates into space at the speed of light.Ans A

*ection 1-3 and 1-,

1+:.What important event was recorded by ancient "hinese astronomers in 1


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A) A planetary nebula a shell of gas leaving an old star

!) 4he remnant of a supernova e/plosion

") A spiral gala/y a collection of 1


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*ection 1-1 the O rays are generated by flares

li$e those on the *un but much stronger.!) spinning neutron stars in binary systems emitting O rays because of mass transfer

onto the neutron star from its normal companion.

") the same as regular 0optical) pulsars but observed in O rays.() blac$ holes in binary systems with the O rays emitted from an accretion dis$

around the blac$ hole.

Ans !*ection 1-1

153.ulsating O-ray sources with periods of a few seconds are caused by

A) the eclipsing of an O-ray-emitting star with a very hot surface by a cool companionin a close binary system.

!) the pulsation in radius temperature and hence luminosity of a hot "epheid variable

star with a surface temperature hot enough to emit O rays.") matter falling violently onto the surface of a rotating neutron star from a close

companion in a binary star system causing an O-ray hot spot that disappears

periodically behind the neutron star.() matter falling onto the surface of a very hot rotating white dwarf star from an

ordinary companion star in a binary system producing an O-ray-emitting hot spot

that disappears periodically behind the white dwarf.

Ans "

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*ection 1-1

155.Bne prominent feature recently identified within many energetic close binary star systemsas a result of their mutual interaction and mass e/change is

A) two oppositely directed high-speed Cets of matter leaving the system.

!) planetary formation between the stars emitting I' radiation from molecularconstituents and dust.

") the beginnings of spiral arms showing the possible origin of spiral arm gala/ies.

() a cool dust cloud surrounding the whole star system hiding it from visible view.Ans A

*ection 1-1

156.*ome obCects in our ;ala/y are observed to have two oppositely directed Cets of materialbeing eCected from them. 4hese gas Cets are believed to be

A) energetic charged particles eCected along the magnetic a/es of a rotating neutron

star.

!) material s8uirted out along the rotation a/is of an accretion dis$ around a neutronstar in a binary star system.

") material transferred onto the surface of a white dwarf star in a binary star systemthen subse8uently blasted into space by runaway thermonuclear fusion reactions.

() material e/pelled from the far side of the companion star in a binary system

repelled by magnetic interaction with the pulsar.Ans !

*ection 1-1

15:.O-ray bursters emit occasional and intense bursts of O rays on top of a steady low-levelO-ray emission. 4hese bursts of O rays are believed to be caused by

A) material from a companion star pulled into an accretion dis$ around a blac$ hole

and conse8uently periodic clumps of material falling from the dis$ into the blac$hole and being compressed produce the O rays.

!) material transferred onto the surface of a neutron star causing the neutron star to

collapse suddenly into a blac$ hole.") material transferred onto the surface of a neutron star in a binary system then

subse8uently ignited in a thermonuclear e/plosion that leaves the neutron star

intact to repeat the process.

() material transferred onto the surface of a white dwarf in a binary star systemproducing a thermonuclear e/plosion at the surface while leaving the white dwarf

intact to repeat the process.

Ans "*ection 1-1

15,.4he difference between a nova and an O-ray burst is thatA) a nova involves an e/plosion on the surface of a white dwarf whereas an O-ray

burst involves an e/plosion on the surface of a neutron star.

!) a nova involves an e/plosion on the surface of a neutron star whereas an O-ray

burst involves an e/plosion on the surface of a white dwarf.

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") a nova involves the complete e/plosive destruction of a white dwarf whereas an O-

ray burst involves an e/plosion on the surface of the white dwarf.

() a nova involves an e/plosion on the surface of a neutron star whereas an O-rayburst involves the complete collapse of a neutron star to form a blac$ hole.

Ans A

*ection 1- and 1-1

16 that is its effective temperature is less than

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J.

Ans "

*ection 1-13

163.A blac$ hole is so named because

A) no light or other electromagnetic radiation can escape from inside it.!) all of its electromagnetic radiation is gravitationally redshifted to the infrared

leaving no light in the optical region.

") it emits a perfect blac$body spectrum.() it is colder than the rest of the universe> that is its effective temperature is less than

J.

Ans "

*ection 1-13

165.What is believed to be the ma/imum mass for a neutron star?

A) 13< solar masses !) 1+ solar masses ") 1. solar mass () solar masses

Ans (*ection 1-13

166.4he escape velocity for material inside a blac$ hole is

A) &ero. ") greater than the speed of light.

!) infinite. () twice that from a neutron star.Ans "

*ection 1-13

16:.Bne feature that distinguishes a blac$ hole from all other obCects in the universe is thatA) the escape velocity from inside this obCect is greater than the speed of light.

!) it emits large 8uantities of O rays.

") its total mass e/ceeds solar masses.() the shape of its gravitational field is always different from that of an ordinary

massive obCect even at large distances from it.

Ans A*ection 1-13

16,.4he escape velocity of matter from the center of a blac$ hole whose mass is greater than

solar masses isA) always e/actly e8ual to the speed of light.

!) 8uite small.

") greater than the speed of light.() about half the speed of light.

Ans "

*ection 1-13

1:


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!) White dwarf neutron star blac$ hole () !lac$ hole neutron star white dwarf

Ans !

*ection "hapter 1

1:1.article degeneracies stemming from the auli Dncertainty rinciple support stars of

various masses. Which of the following lists these degeneracies in increasing order of theamount of mass they can support?

A) lectron neutron 8uar$ ") Puar$ neutron electron

!) lectron 8uar$ neutron () 2eutron electron 8uar$ Ans A

*ection "hapter 1

1:+.Which of the following obCects is 2B4 an endpoint of a star#s evolutionary life?A) 'ed giant !) *upernova ") !lac$ hole () 2eutron star

Ans A

*ection "hapter 1

1:.In which order will a single star of about 1 solar mass progress through the various stages

of evolution?A) lanetary nebula main se8uence neutron star blac$ hole

!) 4 4auri red giant white dwarf neutron star

") lanetary nebula main se8uence red giant white dwarf () 4 4auri main se8uence planetary nebula white dwarf

Ans (

*ection "hapters 1+-1

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Astronomy - Chapter 13 Test