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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?(

)。

參考答案:

Thethermodynamicsofblackhole第一章測(cè)試Whichistheweakestinthefourfundamentalinteractions?()。

參考答案:

GravitationWhichinteractiondoesphotonmediate?()。

參考答案:

ElectromagnetismWhichisthecorrectformofNewton’sinversesquaregravitylaw?()。

參考答案:

****Gravityisuniversalbecausetherearenonegativegravitationalcharge.()

參考答案:

錯(cuò)Whichofthefourfundamentalinteractionsarelongdistanceforce?()。

參考答案:

Gravitation;ElectromagnetismWhichisthecorrectformoftheimportantratiointhissection?()。

參考答案:

****Whichofthefollowinghasthestrongestgravitationalenvironment?()。

參考答案:

StrandofDNAOuruniverseisastronggravitysystem.()

參考答案:

對(duì)Whichofthefollowingstatementaboutblackholesiscorrect?()。

參考答案:

Theireventhorizonis.Whichofthefollowingstatementaboutgravitationalwavesiscorrect?()。

參考答案:

asystemconsistingoftwoblackholes(orBH-star)incloseorbitaroundeachothercangenerategravitationalwaves;GW150914isthefirstgravitationalwavesignalhumanobserved.;Gravitationalwavescanpropagatewiththespeedoflight.第二章測(cè)試Inagravitationalfield,allbodieswiththesameinitialconditionsfollowthesamecurveinspaceandtime.()

參考答案:

對(duì)Whichisthecorrectformofsumofinterioranglesforatriangleonasphere?()。

參考答案:

****Whichisrangeofsumofinterioranglesforatriangleonasphere?()。

參考答案:

****Whichiscorrectformoftheratioofthecircumferencetotheradiusofacircleonasphere?()。

參考答案:

****Forsomegeometry,thesumoftheinteriorangleofatrianglecanbesmallerthan180degree.()

參考答案:

對(duì)Thelineelementforageometrymustbepositivedefinite.()

參考答案:

對(duì)WhichiscorrectformofthelineelementforpolarcoordiantesintheEuclideangeometryofaplane?()。

參考答案:

****Whatisthedistancebetweentwopointandonasphereofradiusa?(assuming)()。

參考答案:

****Thegeometrywiththelineelementisaxisymmetricaboutaaxis.()

參考答案:

對(duì)Whatisthecircumferenceofacircleofconstantonageometrywiththelineelement()。

參考答案:

****第三章測(cè)試Ifthemotionofagivenparticlesatistiesinsomereferenceframe,thenthisframeiscalledainertialframe.()

參考答案:

錯(cuò)Ifreferenceframe(x,y,z)isainertialframeinNewtoniangravity,thenwhichofthefollowingtransformationsalsogiveineritalframe()。

參考答案:

;;WhichofthefollowingtransformationdoesnotbelongtoGalileantransformation?()。

參考答案:

****WhichisthecorrectformofgravitationalpotentialforpointmassM?()。

參考答案:

****WhatisthestrengthofgravitationalinteractionbetweentwospheresR1ofmassm1,m2andR1,R2,seperatedbyr?()。

參考答案:

****Whichofthefollowingstatementabouttherelationshipbetweengravitationalforceandgravitationalpotentialiscorrect?()。

參考答案:

Gravitationalforcepointsatthedirectinwhichgraviattionalpotentialdecrease.;Largegradientofgravitationalpotentialmeanslargegravitationalforce.Themassappearinginwhichofthefollowingexpressionisgravitationalmass?()。

參考答案:

****InNewtoniangravity,wehavetheassumptionthatgravitationalmassandinertialmassareequaltoeachother.()

參考答案:

對(duì)Foraparticleofmassm,movinginapotentialV(x),what’sthecorrectformofitsLagrangian?()。

參考答案:

****WhatistheequationofmotionfortheLagrangian?()。

參考答案:

****第四章測(cè)試TheMaxwellequationstakethesameformineveryinertialframeofNewtonianmechanics.()

參考答案:

錯(cuò)WhichofthefollowingstatementabouttheMichelson-Morleyexperimentarecorrect?()。

參考答案:

nullWhichofthefollowingstatementaboutthefollowingspacetimediagramarecorrect?()。

參考答案:

ParticleBmovesfasteratpointIthanpointII.;ParticleAandparticleBaregettingclosertoeachother.Whichofthefollowingstatementaboutthefollowinglightclockexperimentarecorrect?()。

參考答案:

Intheleftpanel,theperiodofpulseis.;Intherightpanel,theperiodofpulsesatisfies.WhichofthefollowinglineelementcanNOTdescribeMinkowskigeometry?()。

參考答案:

.Whichsetofpoints(ct,x,y,z)aretimelikeseparated?()。

參考答案:

A(0,0,1,0)andB(2,1,0,0).Twotwins,AliceandBob,startfromrestatonepointinspaceattimet1inaninertialframe.Alicemovesawayfromthestartingpointbutlaterreturnstorestatthesamepointattimet2.Bobremainsatrestatthestartingpoint.Whichofthefollowingstatementiscorrect?()。

參考答案:

AliceageslessthanBob.AccordingthespacetimediagramoftwoframesO(x,ct)andO’(x’,ct’),whichofthefollowingstatementarecorrect?()。

參考答案:

nullReferenceBmovesawayfromreferenceAatthespeedof0.6c.InreferenceframeA,arulerisstatic,anditslengthis1m.WhatisthelengthofthisrulermeasuedinreferenceB?()。

參考答案:

0.8m.Aflashlightisstaticonatrainmovingat0.8c.Whatisthespeedoflightmeasuredbypeoplestandingonthegroundbesidethistrain?()。

參考答案:

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))()。

參考答案:

3.WhichofthefollowingisNOTafourvector?()。

參考答案:

.Assuming,whatisthecorrespondingfourvelocity?(Hereweassumec=1)()。

參考答案:

.Foraone-dimensionalmovingparticlesatisfying,whatisitsfourvelocity?()。

參考答案:

.Foraone-dimensionalmovingparticlesatisfying,supposingitsmassism,whatisitsfourforce?()。

參考答案:

.Aparticleofmassmhitanotherparticleofmass2matspeedv.Ifthecollisioniselastic,whatisthetotalenergyofthesystemafterthecollision?()。

參考答案:

.Theworldlineofafreeparticlebetweentwotimelikeseparatedpointsextremizesthepropertimebetweenthem.()

參考答案:

對(duì)Asourceanddetectorarespacedacertainangleφapartontheedgeofarotatingdisk.Thesourceemitsradiationatafrequencyωinitsinstantaneousrestframe.Whatfrequencyistheradiationdetectedat?()。

參考答案:

ω.Arockettravelstowardtheearthwithaspeedof0.8c.Ifthisrocketemitssignaloffrequencyω,what’sthefrequencymeasuredbypeopleontheearth?()。

參考答案:

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)()。

參考答案:

Prof.

Cai.Bytestingthegravitationalredshift,wecandistinguishbetweenNewtoniangravityandEinstein’sgravity.()

參考答案:

對(duì)ForasphericalstarofmassMandradiusR,thegravitationalpotentialatthesurfaceis-GM/R,andthegravitationalpotentialfarawayiszero.Whenabeamoflightisemittedataratefromthesurface,whatistheratioofitsfrequencyatspatialinfinityandatthesurface?()。

參考答案:

.Insideaspaceshuttle,twoping-pongballsareatrest,separatedbys,asshowninthefigure.TheperiodofthespaceshuttleisPandtheradiusoftheearthisR.Aftertimeperiodδtaftertheirrelease,theirseperationbecomess+δs,thenwhichofthefollowingstatementsaretrue?(Assumingtheconditions

參考答案:

nullTheoperationoftheGPSsystemreliesontheaccuratetimemeasurementofsatelliteclock,andthusweneedtotakeintoaccountthegeneralrelativitycorrectioninGPSsystem.()

參考答案:

對(duì)Ingeneralrelativity,thelineelementofasphericalstarofmassMandradiusRhastheform.Whatisthegravitationalpotentialofthisfieldwhere?()。

參考答案:

.Theformulaalsoholdsinstrongfieldanddynamicfieldscenario.()

參考答案:

錯(cuò)Theformulacontainsthecontributionofbothspecialrelativityandgeneralrelativity.()

參考答案:

對(duì)第七章測(cè)試Whichofthefollowingstatementsaboutcoordiantesarecorrect?()。

參考答案:

nullWhichofthefollowingstatementsaboutthePenrosediagramforMinkowskispacetimeinNOTcorrect?()。

參考答案:

**spatialinfinity.**Consideringthedegreeoffreedomcorrespondingtocoordiantetransformation,whatisthenumberofindependentfunctionsassociatedwithametric?()。

參考答案:

6.Whichofthefollowingcanbeaphysicallyallowedmetric?()。

參考答案:

.Whenweworkwithorthonormalbases,thismeansweareworkingwithlocalLorentzframe.()

參考答案:

錯(cuò)Inthiswormholespacetime,whichpointistheclosesttothepointr=10b?()。

參考答案:

Pointr=5b.Whichofthefollowingstatementsiscorrect?()。

參考答案:

Thebaseschosenhereisbothorthonormalbasesandcoordiantebases.Giventhemetricform,andfourvector,whatistheresultfor?()。

參考答案:

.Whichofthefollowingcanbethenormalvectorofanullsurface?()。

參考答案:

(1,1,0,0).In4Dspacetime,thenormalvectorofaspacelike3D-surfaceistimelike,andthenormalvectorofatimelike3D-surfaceisspacelike.()

參考答案:

錯(cuò)第八章測(cè)試Whichofthefollowingaboutvarianceprincipleandgeodesicarecorrect?()。

參考答案:

Geodesicisakindofanalogyofstraightlineincurvedspacetime.;Theworldlineofafreeparticlebetweentwotimelikeseparatedpointsextremizesthepropertimebetweenthem.;Thedistancealongalightrayiszero.Whichofthefollowingarecorrectformofgeodesicsoftheplaneinpolarcoordinates?()。

參考答案:

.;.Thesolutionsforthegeodesicequationsforatwo-dimensionalflatplanearethestraightlines.()

參考答案:

對(duì)Fromthegeodesicequation,whatistheChristoffelsymbol?()。

參考答案:

.AboutthesymmetricityofChristoffelsymbol,whichstatementiscorrect?()。

參考答案:

βandγaresymmetric.TheChristoffelsymbolsareequaltozeroinflatspacetime.()

參考答案:

錯(cuò)Forthespacetimemetric,whichofthefollowingcalculationsarecorrect?()。

參考答案:

.;.Forawormholegeometry,wehavetheradialequationofmotion.Foraradialmovingparticlewithinitialvelocity,howmuchtimeittakesforthisparticletomovefromr=r1ror=r2?(r1>r2)()。

參考答案:

.Thepropertimefornullgeodesicisalwayszero.()

參考答案:

對(duì)Incurvedspacetime,thetrajectoryoflightisbentbythegravitationalfield.()

參考答案:

對(duì)第九章測(cè)試WhichofthefollowingstatementsarecorrectabouttheSchwarzschildsolution?()。

參考答案:

Thissolutionisderivedinahospital.;Thisisthefirstexactsolutionofgeneralrelativity.;Itisasphericallysymmetricsolution.WhichofthefollowingareKillingvectorsinSchwarzschildgeometry?()。

參考答案:

.;.WhichofthefollowingstatementsarecorrectabouttheSchwarzschildsolution?()。

參考答案:

Itisastaticsolution.;Ithasaphysicalsingularityatr=0.Themassofthesunis.EstimatetheSchwarzschildradiusofthesun?()。

參考答案:

3km.Abeamoflightoffrequencyωmeasuredbystationaryobserverisemittedatradiusr=4M.Atwhatradiusitsfrequencymeasuredbystationaryobserverreducestoω/2?()。

參考答案:

8M/3.WhichofthefollowingistheconservedquantitycorrespondingtimeindependenceinSchwarzschildgeometry?()。

參考答案:

.WhichofthefollowingstatementsaboutmassiveparticlemovementinSchwazschildgeometryiscorrect?()。

參考答案:

ParticlewithE=0.02willturnbacktothespatialinfinity.WhichofthefollowingstatementsiscorrectaboutlightdeflectioninSchwarzschildgeometry?()。

參考答案:

Thedeflectionanglebecomeslargerwithaheaviercentralstar.WhichofthefollowingstatementsiscorrectaboutlightrayorbitsinSchwarzschildgeometry?()。

參考答案:

Thereisastablecircularorbitr=6M.Theprecessionoftheperihelionandthelightdeflectionprovideuswithpossiblemethodofgravitationaltheoryexamination.()

參考答案:

對(duì)第十章測(cè)試AgravitationaltheorymusthavecorrectNewtonianlimit.()

參考答案:

對(duì)Gravitationalredshiftexperimentisanimportantprobeoftheequivalenceprinciple.()

參考答案:

對(duì)WhatisthePPNparameterspredictedbygeneralrelativity?()。

參考答案:

.Whichofthefollowingisnotsolarsystemtestofgeneralrelativity?()。

參考答案:

themergerofbinaryblackhole.WhichofthefollowingcanbeusedtomeasurePPNparameterγ?()。

參考答案:

thetimedelayoflight.;thedeflectionoflight.;theprecessionoftheperihelionofaplanetaryorbit.WhichofthefollowingcanbeusedtomeasurePPNparameterβ?()。

參考答案:

theprecessionoftheperihelionofaplanetaryorbit.Whichofthefollowinghasthebiggestinfluencetotheprecisionofgravitationalredshiftexperiment?()。

參考答案:

Dopplereffect.Whyweneedthemoonhereinthelightdeflectexperiment?()。

參考答案:

nullWhyweusedMercuryfortheobservationofperihelionprecession?()。

參考答案:

nullGeneralrelativityistheonlygravitationaltheorywithPPNparameterβ=1andγ=1.()

參考答案:

錯(cuò)第十一章測(cè)試Whatwillmetricbeafterthecoordinatetransformation?()。

參考答案:

.WhichofthefollowingarecorrectaboutthesingularityofSchwarzschildspacetime?()。

參考答案:

Thesingularityatr=0isaphysicalsingularity.;Thesingularityatr=2Misacoordiantesingularity.WhichofthefollowingisNOTworldlinesforradiallightrays?()。

參考答案:

.WhichofthefollowingiscorrectabouttheSchwarzschildmetric?()。

參考答案:

Youwillneverbeabletoreachr=0.;Youwillbeabletocrossr=2Mforatmostonce.Oneobserverfollowsthesurfaceofacollapsingstar,andsendsoutlightsignalsatequalpropertimeintervalsaccordingtoaclockfallingwiththesurface.Anotherobserverreceivesthesesignalsfarawayfromthisthisstar.Whichofthefollowingstatementsarecorrect?()。

參考答案:

nullTheformationofablackhole.Whichofthefollowingarecorrectdescriptionofthepicture?()。

參考答案:

Theorientationofthefuturelightconesatdifferentradiiont=constsurface.;Theworldlineofanobserverfallingfreelythroughthehorizonandintothesingularity.;Thebottomsurfaceistheworldsheetsweptoutbythesurfaceofthecollapsingstarasitprogressestoasingularity.;TheverticalcylinderisthehorizonattheSchwarzschildradius.WhichofthefollowingiscorrectabouttheKruskaldiagramsforSchwarzschildgeometry?()。

參考答案:

a:singularity,b:eventhorizon,c:timellikeworldline,d:constantrline.WhichofthefollowingiscorrectaboutthePenrosediagramforSchwarzschildgeometry?()。

參考答案:

a:singularity,b:eventhorizon,c:futurenullinfinity,d:spacelikeinfinity.WhichofthefollowingmetriccanNOTdescribeSchwarzschildspacetime?()。

參考答案:

.Whichofthefollowingstatementsaboutthecoordinatechoicearecorrect?()。

參考答案:

InsomerespectsthecausalpropertiesoftheSchwarzschildblackholearemoredirectlyrevealedinKruskal-SzekerescoordinatesthanintheEddingtong-Finkelsteinones.;Kruskal-Szekerescoordinatesarethebasisforotherusefulrepresentationsofblack-holegeometry.第十二章測(cè)試Whichofthefollowingastrophysicalobjectstypicallytheheaviest?()。

參考答案:

Blackholeingalaxycenters.WhatisthetypicalmassofblackholeinX-raybinaries?()。

參考答案:

.PBHwithmass()evaporatetoday。

參考答案:

.;.;.Whatisthetypicalfrequencybandofblackhole-neutralstarmerger?()。

參考答案:

X-rayband.Themassfunctionofbinaryblackholemergerdependsontheangleofinclinationoftheorbitalplanetothelineofsight.()

參考答案:

對(duì)Whatisthecorrectformofthefrequencycalculationofbinaryblackholemerger?()。

參考答案:

.WhichofthefollowingiscorrectaboutthefeatureofActiveGalaticNuclei?()。

參考答案:

Theyhaveopticalorradiojetsoutflowingmatter.;Theirspectrumisbroadandnonthermal.;Theirluminosityisveryhigh.Hawkingradiationresultsfromvacuumfluctuationscreatingparticle-antiparticlepairinthevicintyofBHhorizon.()

參考答案:

對(duì)WhichofthefollowingstatementsaboutHawkingradiationiscorrect?()。

參考答案:

null第十三章測(cè)試Accordingtotheweakversionofcosmiccensroshipconjecture,whereofthefollowinganakedsingularityisallowed?()。

參考答案:

thestartofthebigbang.Accordingtothestrongversionofcosmiccensorshipconjecture,theclassicalfateofallobserversshoulebepredictablefrominitialdata.()

參考答案:

對(duì)WhichofthefollowingisthecorrectdescriptionofKerrblackhole?()。

參考答案:

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.()

參考答案:

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?()。

參考答案:

nullWhichofthefollowingfigureshowthegravitationalwavedescribedbythismetric?()。

參考答案:

.Forabeamofgravitationalwavepropagatingalongzaxis,howmanyindependentpolarizationsdoesithave?()。

參考答案:

2.Whichofthefollowingmetriccandescribegravitationalwavepropagatingalongydirection?()。

參考答案:

.IfthearmlengthofLIGOis4km,andtheamplitudeofthegravitationalwaveis.Trytoestimatethedistancechange?()。

參考答案:

.Whichofthefollowingarecorrectaboutthegravitationalwavedetection?()。

參考答案:

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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