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Astronomy103Exam2Review
Spring2009
Whichstarisho=er,aG4mainsequencestaroraG4giant?
A. Themainsequencestar
B. ThegiantC. Bothhavethesametemperature
D. CannotbedeterminedfrominformaLongiven
Whichstarisho=er,aG4mainsequencestaroraG4giant?
A. Themainsequencestar
B. ThegiantC. Bothhavethesametemperature
D. CannotbedeterminedfrominformaLongiven
WhatwouldbeanimmediateindicatortheSunhadstoppedfusinghydrogen?
A.ThelightweseewouldshiNwavelengthsintotheultraviolet.
B.TheSunwouldblowoffitsouterlayersasaplanetarynebula.
C.SolarobservatorieswouldseethattheSun’scorewasrapidlyshrinking.
D.TheamountofneutrinosobservedfromtheSunwouldsuddenlychange.
WhatwouldbeanimmediateindicatortheSunhadstoppedfusinghydrogen?
A.ThelightweseewouldshiNwavelengthsintotheultraviolet.
B.TheSunwouldblowoffitsouterlayersasaplanetarynebula.
C.SolarobservatorieswouldseethattheSun’scorewasrapidlyshrinking.
D.TheamountofneutrinosobservedfromtheSunwouldsuddenlychange.
Aheliumflash:A. OccurstoallstarsB. Occursonlyifthestar’scoreisdegenerateC. CreatesaplanetarynebulaD. Noneoftheabove
Aheliumflash:A. OccurstoallstarsB. Occursonlyifthestar’scoreisdegenerateC. CreatesaplanetarynebulaD. Noneoftheabove
Themainsequenceis:A. Themoststablephaseofastar’slife
B. Wherestarsfusehydrogenintoheliumintheircores
C. ComparaLvelyshorterforhighermassstars
D. Alloftheabove
Themainsequenceis:A. Themoststablephaseofastar’slife
B. Wherestarsfusehydrogenintoheliumintheircores
C. ComparaLvelyshorterforhighermassstars
D. Alloftheabove
Whatistheheaviestelementthatfusioncanproduceinthecoresofmassivestars?
A. Helium
B. SiliconC. IronD. Uranium
Whatistheheaviestelementthatfusioncanproduceinthecoresofmassivestars?
A. Helium
B. SiliconC. IronD. Uranium
WhitedwarfsshineduetoA. HydrogenshellburningB. Corefissionofheavyelements
C. ReflecLonoflightfromtheircompanionstarinabinarysystem
D. Noneoftheabove
WhitedwarfsshineduetoA. HydrogenshellburningB. Corefissionofheavyelements
C. ReflecLonoflightfromtheircompanionstarinabinarysystem
D. Noneoftheabove
ProtostarscanbestbeobservedintheA. UltravioletB. InfraredC. VisibleD. X‐ray
ProtostarscanbestbeobservedintheA. UltravioletB. InfraredC. VisibleD. X‐ray
Whichofthesestarclustersistheoldest?A.B.
C.D.Theyallhavethe
sameage
Whichofthesestarclustersistheoldest?A.B.
C.D.Theyallhavethe
sameage
NotallvisualbinarieshaveobservedDopplershiNs.Why?
A. SomewillbeatananglewherethestarsarenevermovingdirectlytowardorawayfromEarth.
B. SomebinarysystemsarestaLonaryC. SomebinarysystemshaveveryellipLcal
orbitsD. Alloftheabove
NotallvisualbinarieshaveobservedDopplershiNs.Why?
A. SomewillbeatananglewherethestarsarenevermovingdirectlytowardorawayfromEarth.
B. SomebinarysystemsarestaLonaryC. SomebinarysystemshaveveryellipLcal
orbitsD. Alloftheabove
Thenetresultofthep‐pchainisthat__hydrogenareturnedinto__helium
A. 1;2B. 3;2C. 4;1D. 4;2
Thenetresultofthep‐pchainisthat__hydrogenareturnedinto__helium
A. 1;2B. 3;2C. 4;1D. 4;2
ThereddeststarsspendthemostLmeonthemainsequencebecause
A. Theyarethemostmassivestarsandhavemorehydrogenfuel
B. Theircorepressureandtemperaturearelowsotherateofhydrogenfusionislow
C. TheyarefullyconvecLveD. BandC
ThereddeststarsspendthemostLmeonthemainsequencebecause
A. Theyarethemostmassivestarsandhavemorehydrogenfuel
B. Theircorepressureandtemperaturearelowsotherateofhydrogenfusionislow
C. TheyarefullyconvecLveD. BandC
WhydoweuseTypeIasupernovaetomakedistancemeasurements?
A. TheyallhappenatthesamedistancefromEarth
B. Theonesnearertousaremoreluminous
C. Theyallhavethesamemassandleavenoremnant
D. Alloftheabove
WhydoweuseTypeIasupernovaetomakedistancemeasurements?
A. TheyallhappenatthesamedistancefromEarth
B. Theonesnearertousaremoreluminous
C. Theyallhavethesamemassandleavenoremnant
D. Alloftheabove
GranulaLononthephotosphereoftheSunistheresultof
A. DustparLclesinthephotosphereB. DistorLoncausedbylightpassingthrough
theturbulentsolaratmosphereC. MoLonsoflargeamountsofgasmovingout
fromtheinterioroftheSunandthenbackin
D. TheSun’smagneLcfield
GranulaLononthephotosphereoftheSunistheresultof
A. DustparLclesinthephotosphereB. DistorLoncausedbylightpassingthrough
theturbulentsolaratmosphereC. MoLonsoflargeamountsofgasmovingout
fromtheinterioroftheSunandthenbackin
D. TheSun’smagneLcfield
Ifblackholesemitnolight,howcanweobservethem?WhichofthefollowingobservaLonmethodsisnotvalid?
A.Ma=erpulledoffacompanionstaremitsacharacterisLcX‐rayspectrumasitfallstowardtheblackhole.
B.Companionstarssuddenlydisappearfromviewastheyplungeintotheblackhole.
C.BlackholescanactasgravitaLonallenses,formingmulLpleimagesofobjectsbeyondthehole.
D.AstarthatwobblesinitspropermoLoncanbeexhibiLngevidenceofitsorbitalmoLonaroundanunseencompanion.
Ifblackholesemitnolight,howcanweobservethem?WhichofthefollowingobservaLonmethodsisnotvalid?
A.Ma=erpulledoffacompanionstaremitsacharacterisLcX‐rayspectrumasitfallstowardtheblackhole.
B.Companionstarssuddenlydisappearfromviewastheyplungeintotheblackhole.
C.BlackholescanactasgravitaLonallenses,formingmulLpleimagesofobjectsbeyondthehole.
D.AstarthatwobblesinitspropermoLoncanbeexhibiLngevidenceofitsorbitalmoLonaroundanunseencompanion.
TheinternalstructureoftheSun,fromthecentertothesurfaceis
A. Energy‐generaLngcore,radiaLveregion,convecLonregion
B. Energy‐generaLngcore,convecLveregion,radiaLveregion
C. ConvecLvecore,chemicallyreacLngregion,radiaLveregion
D. Energy‐generaLngcore,convecLveregion
TheinternalstructureoftheSun,fromthecentertothesurfaceis
A. Energy‐generaLngcore,radiaLveregion,convecLonregion
B. Energy‐generaLngcore,convecLveregion,radiaLveregion
C. ConvecLvecore,chemicallyreacLngregion,radiaLveregion
D. Energy‐generaLngcore,convecLveregion
Whichofthesespectralclassescorrespondtothereddeststars?
A. OB. FC. AD. G
Whichofthesespectralclassescorrespondtothereddeststars?
A. OB. FC. AD. G
OnanH‐Rdiagramastarisfoundtobeevolvingtotherightataconstantluminosity.Weknowthatthestarisbecoming
A. OnlylargerB. Onlysmaller
C. Bothsmallerandcooler
D. Bothlargerandcooler
OnanH‐Rdiagramastarisfoundtobeevolvingtotherightataconstantluminosity.Weknowthatthestarisbecoming
A. OnlylargerB. Onlysmaller
C. Bothsmallerandcooler
D. Bothlargerandcooler
ThedifferencebetweenTypeIaandTypeIIsupernovais
A. Theirmasses
B. TheiragesC. TheirchemicalcomposiLons
D. Alloftheabove
ThedifferencebetweenTypeIaandTypeIIsupernovais
A. Theirmasses
B. TheiragesC. TheirchemicalcomposiLons
D. Alloftheabove
ThemechanismthatresultsinhighrotaLonratesforcertainpulsarsisprobably
A.massexchangewithabinarycompanion.B. collapseoftheneutronstar,similartothewaythataskaterincreasesrotaLoninaspin.
C. masslossfromtheneutronstar,theremainderspinningfasterasaresult.
D.themergerofapairofneutronstarstoformasingleobject.
ThemechanismthatresultsinhighrotaLonratesforcertainpulsarsisprobably
A.massexchangewithabinarycompanion.B. collapseoftheneutronstar,similartothewaythataskaterincreasesrotaLoninaspin.
C. masslossfromtheneutronstar,theremainderspinningfasterasaresult.
D.themergerofapairofneutronstarstoformasingleobject.
Whenmaterialtransfersfromacompaniontoawhitedwarf,wenormallyseea
A. SupernovaB. NovaC. X‐raybursterD. Gamma‐rayburster
Whenmaterialtransfersfromacompaniontoawhitedwarf,wenormallyseea
A. SupernovaB. NovaC. X‐raybursterD. Gamma‐rayburster
Twoobservershavetwoclocks,oneatrestontheEarth’ssurfaceandoneatresthighabovetheEarth’ssurface.Whichstatementiscorrect?
A. Eachobserverwillseetheother'sclocktoberunningslowwithrespecttotheobserver'sownclock.
B. Eachobserverwillseetheother'sclocktoberunningfastwithrespecttotheobserver'sownclock.
C. Bothobserversagree:sincetheclocksarenotmovingwithrespecttoeachothertheclocksrunatthesamespeedandreadthesameLme.
D. Bothobserversagree:theclocknearEarthisrunningslowerthantheclockhighaboveEarth'ssurface.
Twoobservershavetwoclocks,oneatrestontheEarth’ssurfaceandoneatresthighabovetheEarth’ssurface.Whichstatementiscorrect?
A. Eachobserverwillseetheother'sclocktoberunningslowwithrespecttotheobserver'sownclock.
B. Eachobserverwillseetheother'sclocktoberunningfastwithrespecttotheobserver'sownclock.
C. Bothobserversagree:sincetheclocksarenotmovingwithrespecttoeachothertheclocksrunatthesamespeedandreadthesameLme.
D. Bothobserversagree:theclocknearEarthisrunningslowerthantheclockhighaboveEarth'ssurface.
WhichofthefollowingevoluLonaryphasesareinorderfromyoungesttooldest?
A.Protostar,redgiant,mainsequence,whitedwarf
B.Protostar,mainsequence,whitedwarf,neutronstar
C.Protostar,mainsequence,redgiant,whitedwarf
D.Protostar,planetarynebula,mainsequence,supernova
WhichofthefollowingevoluLonaryphasesareinorderfromyoungesttooldest?
A.Protostar,redgiant,mainsequence,whitedwarf
B.Protostar,mainsequence,whitedwarf,neutronstar
C.Protostar,mainsequence,redgiant,whitedwarf
D.Protostar,planetarynebula,mainsequence,supernova
Aplanetarynebulais:A. Theprogenitorofasolarsystem
B. Whatremainswhenawhitedwarfexplodesasasupernova
C. Ashellofgasejectedfromastarlateinitslife
D. Thecloudfromwhichprotostarsform
Aplanetarynebulais:A. Theprogenitorofasolarsystem
B. Whatremainswhenawhitedwarfexplodesasasupernova
C. Ashellofgasejectedfromastarlateinitslife
D. Thecloudfromwhichprotostarsform
ThestarsCapella,Aldebaran,andRegulushaveparallaxanglesof0.079,0.05,and0.041arcsec,respecLvely.Whichstaristhefarthestaway?
A. CapellaB. AldebaranC. RegulusD. CannotbedeterminedfrominformaLon
given
ThestarsCapella,Aldebaran,andRegulushaveparallaxanglesof0.079,0.05,and0.041arcsec,respecLvely.Whichstaristhefarthestaway?
A. CapellaB. AldebaranC. RegulusD. CannotbedeterminedfrominformaLon
given
Whyaretherenostarsoflessmassivethanapproximately0.08solarmasses?
A. TheyaresLllcontracLngandhaven’tyetreachedthemainsequence
B. Theycannotcompresstheircorestohydrogenfusiontemperatures
C. Theirmassissosmallthatdeuteriumfusionblaststhemapart
D. Noneoftheabove
Whyaretherenostarsoflessmassivethanapproximately0.08solarmasses?
A. TheyaresLllcontracLngandhaven’tyetreachedthemainsequence
B. Theycannotcompresstheircorestohydrogenfusiontemperatures
C. Theirmassissosmallthatdeuteriumfusionblaststhemapart
D. Noneoftheabove
Formainsequencestars,astemperatureincreases
A. Massincreases
B. RadiusdecreasesC. Luminositydecreases
D. Noneoftheabove
Formainsequencestars,astemperatureincreases
A. Massincreases
B. RadiusdecreasesC. Luminositydecreases
D. Noneoftheabove
TheSunissupportedagainsttheforceofitsowngravityby
A. GaspressureB. TheforceexertedbyescapingneutrinosC. ForcesfrommagneLcfields
D. RapidrotaLon
TheSunissupportedagainsttheforceofitsowngravityby
A. GaspressureB. TheforceexertedbyescapingneutrinosC. ForcesfrommagneLcfields
D. RapidrotaLon
