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時(shí)間和空間知到章節(jié)測(cè)試答案智慧樹(shù)2023年最新中國(guó)科學(xué)技術(shù)大學(xué)緒論單元測(cè)試WhichofthefollowingtopicsisNOTcoveredinthiscourse?(
)。
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Thethermodynamicsofblackhole第一章測(cè)試Whichistheweakestinthefourfundamentalinteractions?()。
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GravitationWhichinteractiondoesphotonmediate?()。
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ElectromagnetismWhichisthecorrectformofNewton’sinversesquaregravitylaw?()。
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****Gravityisuniversalbecausetherearenonegativegravitationalcharge.()
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錯(cuò)Whichofthefourfundamentalinteractionsarelongdistanceforce?()。
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Gravitation;ElectromagnetismWhichisthecorrectformoftheimportantratiointhissection?()。
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****Whichofthefollowinghasthestrongestgravitationalenvironment?()。
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StrandofDNAOuruniverseisastronggravitysystem.()
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對(duì)Whichofthefollowingstatementaboutblackholesiscorrect?()。
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Theireventhorizonis.Whichofthefollowingstatementaboutgravitationalwavesiscorrect?()。
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asystemconsistingoftwoblackholes(orBH-star)incloseorbitaroundeachothercangenerategravitationalwaves;GW150914isthefirstgravitationalwavesignalhumanobserved.;Gravitationalwavescanpropagatewiththespeedoflight.第二章測(cè)試Inagravitationalfield,allbodieswiththesameinitialconditionsfollowthesamecurveinspaceandtime.()
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對(duì)Whichisthecorrectformofsumofinterioranglesforatriangleonasphere?()。
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****Whichisrangeofsumofinterioranglesforatriangleonasphere?()。
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****Whichiscorrectformoftheratioofthecircumferencetotheradiusofacircleonasphere?()。
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****Forsomegeometry,thesumoftheinteriorangleofatrianglecanbesmallerthan180degree.()
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對(duì)Thelineelementforageometrymustbepositivedefinite.()
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對(duì)WhichiscorrectformofthelineelementforpolarcoordiantesintheEuclideangeometryofaplane?()。
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****Whatisthedistancebetweentwopointandonasphereofradiusa?(assuming)()。
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****Thegeometrywiththelineelementisaxisymmetricaboutaaxis.()
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對(duì)Whatisthecircumferenceofacircleofconstantonageometrywiththelineelement()。
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****第三章測(cè)試Ifthemotionofagivenparticlesatistiesinsomereferenceframe,thenthisframeiscalledainertialframe.()
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錯(cuò)Ifreferenceframe(x,y,z)isainertialframeinNewtoniangravity,thenwhichofthefollowingtransformationsalsogiveineritalframe()。
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;;WhichofthefollowingtransformationdoesnotbelongtoGalileantransformation?()。
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****WhichisthecorrectformofgravitationalpotentialforpointmassM?()。
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****WhatisthestrengthofgravitationalinteractionbetweentwospheresR1ofmassm1,m2andR1,R2,seperatedbyr?()。
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****Whichofthefollowingstatementabouttherelationshipbetweengravitationalforceandgravitationalpotentialiscorrect?()。
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Gravitationalforcepointsatthedirectinwhichgraviattionalpotentialdecrease.;Largegradientofgravitationalpotentialmeanslargegravitationalforce.Themassappearinginwhichofthefollowingexpressionisgravitationalmass?()。
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****InNewtoniangravity,wehavetheassumptionthatgravitationalmassandinertialmassareequaltoeachother.()
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對(duì)Foraparticleofmassm,movinginapotentialV(x),what’sthecorrectformofitsLagrangian?()。
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****WhatistheequationofmotionfortheLagrangian?()。
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****第四章測(cè)試TheMaxwellequationstakethesameformineveryinertialframeofNewtonianmechanics.()
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錯(cuò)WhichofthefollowingstatementabouttheMichelson-Morleyexperimentarecorrect?()。
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nullWhichofthefollowingstatementaboutthefollowingspacetimediagramarecorrect?()。
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ParticleBmovesfasteratpointIthanpointII.;ParticleAandparticleBaregettingclosertoeachother.Whichofthefollowingstatementaboutthefollowinglightclockexperimentarecorrect?()。
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Intheleftpanel,theperiodofpulseis.;Intherightpanel,theperiodofpulsesatisfies.WhichofthefollowinglineelementcanNOTdescribeMinkowskigeometry?()。
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.Whichsetofpoints(ct,x,y,z)aretimelikeseparated?()。
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A(0,0,1,0)andB(2,1,0,0).Twotwins,AliceandBob,startfromrestatonepointinspaceattimet1inaninertialframe.Alicemovesawayfromthestartingpointbutlaterreturnstorestatthesamepointattimet2.Bobremainsatrestatthestartingpoint.Whichofthefollowingstatementiscorrect?()。
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AliceageslessthanBob.AccordingthespacetimediagramoftwoframesO(x,ct)andO’(x’,ct’),whichofthefollowingstatementarecorrect?()。
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nullReferenceBmovesawayfromreferenceAatthespeedof0.6c.InreferenceframeA,arulerisstatic,anditslengthis1m.WhatisthelengthofthisrulermeasuedinreferenceB?()。
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0.8m.Aflashlightisstaticonatrainmovingat0.8c.Whatisthespeedoflightmeasuredbypeoplestandingonthegroundbesidethistrain?()。
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c.第五章測(cè)試Assuminga=(2,1,3,0),b=(1,2,1,4),whatistheresultfora*b?(Herewehaveη=diag(-1,1,1,1))()。
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3.WhichofthefollowingisNOTafourvector?()。
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.Assuming,whatisthecorrespondingfourvelocity?(Hereweassumec=1)()。
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.Foraone-dimensionalmovingparticlesatisfying,whatisitsfourvelocity?()。
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.Foraone-dimensionalmovingparticlesatisfying,supposingitsmassism,whatisitsfourforce?()。
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.Aparticleofmassmhitanotherparticleofmass2matspeedv.Ifthecollisioniselastic,whatisthetotalenergyofthesystemafterthecollision?()。
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.Theworldlineofafreeparticlebetweentwotimelikeseparatedpointsextremizesthepropertimebetweenthem.()
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對(duì)Asourceanddetectorarespacedacertainangleφapartontheedgeofarotatingdisk.Thesourceemitsradiationatafrequencyωinitsinstantaneousrestframe.Whatfrequencyistheradiationdetectedat?()。
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ω.Arockettravelstowardtheearthwithaspeedof0.8c.Ifthisrocketemitssignaloffrequencyω,what’sthefrequencymeasuredbypeopleontheearth?()。
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3ω.ReferenceBmovesalongthex-axisofreferenceAatspeedv.WhenreferenceAemitsabeamoflightatydirection,theanglebetweenthelightandx’-axisdetectedbyreferenceBis53degrees.Ifwewantthisangletodecreaseto37degrees,howfastshouldreferenceBmove?()。
參考答案:
(4/3)v.第六章測(cè)試Whichofthefollowingstatementsarecorrect?()。
參考答案:
Theequalityofgravitationalandinertialmassisoneofthemostaccuratelytestedprinciplesinallphysics.;Einstein’sequivalenceprinciplesaysthat,thereisnoexperimentthatcandistinguishauniformaccelerationfromauniformgravitationalfield.;IntheEotvosexperiment,thesystemcanbebalancedatrestshowstheequivalenceofgravitationalandinertialmass.;TheEotvosexperimentisafamousexperimentofthetestofequivalenceprinciple.Assumingtheaccelerationofgravityatthesurfaceoftheearth,howwidetheelevatorhavetobeforethelightraytofallby1mmoverthecourseofitstransit?()。
參考答案:
.Inaskydivingactivity,youjumpoutsidethesamestaticplane3safterProf.
Caijump.Accordingtotheequivalenceprinciple,whoofyoutwohaveaheartjumpingfaster?(Consideridealscenariohere)()。
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Prof.
Cai.Bytestingthegravitationalredshift,wecandistinguishbetweenNewtoniangravityandEinstein’sgravity.()
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對(duì)ForasphericalstarofmassMandradiusR,thegravitationalpotentialatthesurfaceis-GM/R,andthegravitationalpotentialfarawayiszero.Whenabeamoflightisemittedataratefromthesurface,whatistheratioofitsfrequencyatspatialinfinityandatthesurface?()。
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.Insideaspaceshuttle,twoping-pongballsareatrest,separatedbys,asshowninthefigure.TheperiodofthespaceshuttleisPandtheradiusoftheearthisR.Aftertimeperiodδtaftertheirrelease,theirseperationbecomess+δs,thenwhichofthefollowingstatementsaretrue?(Assumingtheconditions
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nullTheoperationoftheGPSsystemreliesontheaccuratetimemeasurementofsatelliteclock,andthusweneedtotakeintoaccountthegeneralrelativitycorrectioninGPSsystem.()
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對(duì)Ingeneralrelativity,thelineelementofasphericalstarofmassMandradiusRhastheform.Whatisthegravitationalpotentialofthisfieldwhere?()。
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.Theformulaalsoholdsinstrongfieldanddynamicfieldscenario.()
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錯(cuò)Theformulacontainsthecontributionofbothspecialrelativityandgeneralrelativity.()
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對(duì)第七章測(cè)試Whichofthefollowingstatementsaboutcoordiantesarecorrect?()。
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nullWhichofthefollowingstatementsaboutthePenrosediagramforMinkowskispacetimeinNOTcorrect?()。
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**spatialinfinity.**Consideringthedegreeoffreedomcorrespondingtocoordiantetransformation,whatisthenumberofindependentfunctionsassociatedwithametric?()。
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6.Whichofthefollowingcanbeaphysicallyallowedmetric?()。
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.Whenweworkwithorthonormalbases,thismeansweareworkingwithlocalLorentzframe.()
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錯(cuò)Inthiswormholespacetime,whichpointistheclosesttothepointr=10b?()。
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Pointr=5b.Whichofthefollowingstatementsiscorrect?()。
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Thebaseschosenhereisbothorthonormalbasesandcoordiantebases.Giventhemetricform,andfourvector,whatistheresultfor?()。
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.Whichofthefollowingcanbethenormalvectorofanullsurface?()。
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(1,1,0,0).In4Dspacetime,thenormalvectorofaspacelike3D-surfaceistimelike,andthenormalvectorofatimelike3D-surfaceisspacelike.()
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錯(cuò)第八章測(cè)試Whichofthefollowingaboutvarianceprincipleandgeodesicarecorrect?()。
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Geodesicisakindofanalogyofstraightlineincurvedspacetime.;Theworldlineofafreeparticlebetweentwotimelikeseparatedpointsextremizesthepropertimebetweenthem.;Thedistancealongalightrayiszero.Whichofthefollowingarecorrectformofgeodesicsoftheplaneinpolarcoordinates?()。
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.;.Thesolutionsforthegeodesicequationsforatwo-dimensionalflatplanearethestraightlines.()
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對(duì)Fromthegeodesicequation,whatistheChristoffelsymbol?()。
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.AboutthesymmetricityofChristoffelsymbol,whichstatementiscorrect?()。
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βandγaresymmetric.TheChristoffelsymbolsareequaltozeroinflatspacetime.()
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錯(cuò)Forthespacetimemetric,whichofthefollowingcalculationsarecorrect?()。
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.;.Forawormholegeometry,wehavetheradialequationofmotion.Foraradialmovingparticlewithinitialvelocity,howmuchtimeittakesforthisparticletomovefromr=r1ror=r2?(r1>r2)()。
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.Thepropertimefornullgeodesicisalwayszero.()
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對(duì)Incurvedspacetime,thetrajectoryoflightisbentbythegravitationalfield.()
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對(duì)第九章測(cè)試WhichofthefollowingstatementsarecorrectabouttheSchwarzschildsolution?()。
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Thissolutionisderivedinahospital.;Thisisthefirstexactsolutionofgeneralrelativity.;Itisasphericallysymmetricsolution.WhichofthefollowingareKillingvectorsinSchwarzschildgeometry?()。
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.;.WhichofthefollowingstatementsarecorrectabouttheSchwarzschildsolution?()。
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Itisastaticsolution.;Ithasaphysicalsingularityatr=0.Themassofthesunis.EstimatetheSchwarzschildradiusofthesun?()。
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3km.Abeamoflightoffrequencyωmeasuredbystationaryobserverisemittedatradiusr=4M.Atwhatradiusitsfrequencymeasuredbystationaryobserverreducestoω/2?()。
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8M/3.WhichofthefollowingistheconservedquantitycorrespondingtimeindependenceinSchwarzschildgeometry?()。
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.WhichofthefollowingstatementsaboutmassiveparticlemovementinSchwazschildgeometryiscorrect?()。
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ParticlewithE=0.02willturnbacktothespatialinfinity.WhichofthefollowingstatementsiscorrectaboutlightdeflectioninSchwarzschildgeometry?()。
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Thedeflectionanglebecomeslargerwithaheaviercentralstar.WhichofthefollowingstatementsiscorrectaboutlightrayorbitsinSchwarzschildgeometry?()。
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Thereisastablecircularorbitr=6M.Theprecessionoftheperihelionandthelightdeflectionprovideuswithpossiblemethodofgravitationaltheoryexamination.()
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對(duì)第十章測(cè)試AgravitationaltheorymusthavecorrectNewtonianlimit.()
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對(duì)Gravitationalredshiftexperimentisanimportantprobeoftheequivalenceprinciple.()
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對(duì)WhatisthePPNparameterspredictedbygeneralrelativity?()。
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.Whichofthefollowingisnotsolarsystemtestofgeneralrelativity?()。
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themergerofbinaryblackhole.WhichofthefollowingcanbeusedtomeasurePPNparameterγ?()。
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thetimedelayoflight.;thedeflectionoflight.;theprecessionoftheperihelionofaplanetaryorbit.WhichofthefollowingcanbeusedtomeasurePPNparameterβ?()。
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theprecessionoftheperihelionofaplanetaryorbit.Whichofthefollowinghasthebiggestinfluencetotheprecisionofgravitationalredshiftexperiment?()。
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Dopplereffect.Whyweneedthemoonhereinthelightdeflectexperiment?()。
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nullWhyweusedMercuryfortheobservationofperihelionprecession?()。
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nullGeneralrelativityistheonlygravitationaltheorywithPPNparameterβ=1andγ=1.()
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錯(cuò)第十一章測(cè)試Whatwillmetricbeafterthecoordinatetransformation?()。
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.WhichofthefollowingarecorrectaboutthesingularityofSchwarzschildspacetime?()。
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Thesingularityatr=0isaphysicalsingularity.;Thesingularityatr=2Misacoordiantesingularity.WhichofthefollowingisNOTworldlinesforradiallightrays?()。
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.WhichofthefollowingiscorrectabouttheSchwarzschildmetric?()。
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Youwillneverbeabletoreachr=0.;Youwillbeabletocrossr=2Mforatmostonce.Oneobserverfollowsthesurfaceofacollapsingstar,andsendsoutlightsignalsatequalpropertimeintervalsaccordingtoaclockfallingwiththesurface.Anotherobserverreceivesthesesignalsfarawayfromthisthisstar.Whichofthefollowingstatementsarecorrect?()。
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nullTheformationofablackhole.Whichofthefollowingarecorrectdescriptionofthepicture?()。
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Theorientationofthefuturelightconesatdifferentradiiont=constsurface.;Theworldlineofanobserverfallingfreelythroughthehorizonandintothesingularity.;Thebottomsurfaceistheworldsheetsweptoutbythesurfaceofthecollapsingstarasitprogressestoasingularity.;TheverticalcylinderisthehorizonattheSchwarzschildradius.WhichofthefollowingiscorrectabouttheKruskaldiagramsforSchwarzschildgeometry?()。
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a:singularity,b:eventhorizon,c:timellikeworldline,d:constantrline.WhichofthefollowingiscorrectaboutthePenrosediagramforSchwarzschildgeometry?()。
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a:singularity,b:eventhorizon,c:futurenullinfinity,d:spacelikeinfinity.WhichofthefollowingmetriccanNOTdescribeSchwarzschildspacetime?()。
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.Whichofthefollowingstatementsaboutthecoordinatechoicearecorrect?()。
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InsomerespectsthecausalpropertiesoftheSchwarzschildblackholearemoredirectlyrevealedinKruskal-SzekerescoordinatesthanintheEddingtong-Finkelsteinones.;Kruskal-Szekerescoordinatesarethebasisforotherusefulrepresentationsofblack-holegeometry.第十二章測(cè)試Whichofthefollowingastrophysicalobjectstypicallytheheaviest?()。
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Blackholeingalaxycenters.WhatisthetypicalmassofblackholeinX-raybinaries?()。
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.PBHwithmass()evaporatetoday。
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.;.;.Whatisthetypicalfrequencybandofblackhole-neutralstarmerger?()。
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X-rayband.Themassfunctionofbinaryblackholemergerdependsontheangleofinclinationoftheorbitalplanetothelineofsight.()
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對(duì)Whatisthecorrectformofthefrequencycalculationofbinaryblackholemerger?()。
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.WhichofthefollowingiscorrectaboutthefeatureofActiveGalaticNuclei?()。
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Theyhaveopticalorradiojetsoutflowingmatter.;Theirspectrumisbroadandnonthermal.;Theirluminosityisveryhigh.Hawkingradiationresultsfromvacuumfluctuationscreatingparticle-antiparticlepairinthevicintyofBHhorizon.()
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對(duì)WhichofthefollowingstatementsaboutHawkingradiationiscorrect?()。
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null第十三章測(cè)試Accordingtotheweakversionofcosmiccensroshipconjecture,whereofthefollowinganakedsingularityisallowed?()。
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thestartofthebigbang.Accordingtothestrongversionofcosmiccensorshipconjecture,theclassicalfateofallobserversshoulebepredictablefrominitialdata.()
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對(duì)WhichofthefollowingisthecorrectdescriptionofKerrblackhole?()。
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nullWhichofthefollowingsoftwaremayhelpyoutogettheKerrsolutionanalytically?()。
參考答案:
Mathematica.WhichofthefollowingstatementaboutthesymmetrypropertiesandKillingfieldsaboutKerrblackholearecorrect?()。
參考答案:
Ithas2independentKillingfields.;isaKillingfieldofthespacetimerelatedtostationalsymmetry.;SchwarzschildspacetimehasbettersymmetrythanKerrspacetime.WhichofthefollowingstatementaboutthesymmetrypropertiesandKillingfieldsaboutKerrblackholearecorrect?()。
參考答案:
SchwarzschildspacetimehasbettersymmetrythanKerrspacetime.;Ithas2independentKillingfields.;isaKillingfieldofthespacetimerelatedtostationalsymmetry.WhichofthefollowingstatementaboutthecoordinatesingularityofKerrspacetimearecorrect?()。ThemetricofKerrgeometryisgivenbywhere
參考答案:
Therearecoordinatesingularitieswhere?vanishes.;ThecoordinatesingularityofKerrspacetimeisjustlikethesingularityinSchwarzschildcoordinatesattheSchwarzschildradius.;Therearetwocoordinatesingularitiesat.WhereistherealsingularitiesofKerrspacetime?()。
參考答案:
.SchwarzschildsolutionandKerrsolutionaretheonlyallowedvacuumsolution.()
參考答案:
錯(cuò)WhichofthefollowingstatementaboutKerrblackholeiscorrect?(
)。
參考答案:
ThissolutionwasgivenbyKerr.第十四章測(cè)試Whichofthefollowingstatementsaboutgravitationalwavesarecorrect?()。
參考答案:
nullOurcalculationinthissectionrequiresthatthegravitationalwaveisonlyasmallperturbation.()
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對(duì)ThereisoneparticleAatorigin(0,0,0),andanotherparticleBat(1,0,0).Abeamofgravitationalwavepropagatealongzaxis,andtheamplitudeofthisgravitationalwaveis0.8.Whichofthefollowingstatementsarecorrect?()。
參考答案:
nullThereisoneparticleAatorigin(0,0,0),andanotherparticleBat(0,0,1).Abeamofgravitationalwavepropagatealongzaxis,andtheamplitudeofthisgravitationalwaveis0.8.Whichofthefollowingstatementsarecorrect?()。
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nullWhichofthefollowingfigureshowthegravitationalwavedescribedbythismetric?()。
參考答案:
.Forabeamofgravitationalwavepropagatingalongzaxis,howmanyindependentpolarizationsdoesithave?()。
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2.Whichofthefollowingmetriccandescribegravitationalwavepropagatingalongydirection?()。
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.IfthearmlengthofLIGOis4km,andtheamplitudeofthegravitationalwaveis.Trytoestimatethedistancechange?()。
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.Whichofthefollowingarecorrectaboutthegravitationalwavedetection?()。
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WhenL1getslarger,L2getssmalleratthesametime.;Theorientationofthisequipmentplayaroleinthefinalsignalreceived.;Thedistancechangeisdetectedbylaserinterference.Whichofthefollowingarecorrectaboutgravitationalwaves?()。
參考答案:
GWcancarryenergytopropagate.;Theypropagatewiththespeedoflight.;TheenergydensityofGWisdefinedasanaverageoverservalwavelengths.第十五章測(cè)試Cosmologicalprinciplesaysthattheuniverseisisotropic(thesameinonedirectionasinanyother)andhomogeneous(thesameinoneplaceasinanyother).()
參考答案:
對(duì)Whichofthefollowingarecorrect?()。
參考答案:
TheFriedmannequationswerederivedin1923.;metricassumesthatouruniverseisspatiallyflat.;theFriedmannequation,conservationequationandequationofstateareindependentfromeachother.Whichofthefollowingarecorrectaboutthebasic
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