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Mathmodelofmetalheatingunderactionbylaserbeam知到智慧樹章節(jié)測試課后答案2024年秋華南理工大學第一章單元測試
Stepsatthemathmodelingare()。
A:Analysisofthephysicalandchemicalprocessesoccurringinprocessunderconsideration.B:Writingofthedifferential(andother)equationsdescribingtheprocessunderconsideration.C:Quality’sanalysisofuniquenesssolutionormultiplicityoftheproblemsolution.Forthisaim,asarule,thepointwisemodelisderivedfromPDEs.D:Developingfinite-differenceschemes(finite-elementsscheme)fornumericalsolutionoftheproblemunderconsideration.E:Analysisofphysicalunitsofeachtermsinvolvingintheequations.F:Derivationoftheconservationlaws(integralsofmotions)fortheproblemunderconsideration.G:Introducingdimensionlessvariablesandwritingsimilarityparameters(π-parameters).
答案:Writingofthedifferential(andother)equationsdescribingtheprocessunderconsideration.Whichofthefollowingoptionsistherequirementforthenumericalmethod?()。
A:Highorderofapproximationofthedifferentialequationsbynumericalsolution.B:FDSmustbeeconomicalone.Itmeansthat3Dor2Ddifferenceequationsmustbesolvedassequenceof1Ddifferenceequations.C:AlloftheaboveD:Thenumericalmethodmustbetestedbyusingthewell-knownsolutionsoftheproblemunderconsideration.
答案:AlloftheaboveThefollowingareapplicationsoflaserradiationinthefieldofphysics?()。
A:Opticaldatastorage(CD,SVD,5Dopticalmemory)B:NanophotonicsC:AstrophysicsD:Photochemistry
答案:Opticaldatastorage(CD,SVD,5Dopticalmemory);Nanophotonics;AstrophysicsWhatfieldscanlaserradiationbeusedin?()。
A:LaserMedicineB:PhysicsC:LaserBiologyD:LaserChemistry
答案:LaserMedicine;Physics;LaserBiology;LaserChemistryWhatarethepropertiesoflaserradiation?()。
A:Coherence(spatial,temporal).B:Divergenceoflaserbeamissmall.C:Polarization.D:Laseremitsmonochromaticwave.Usuallylaseremitssinglewavelength.E:Stimulatedemission.
答案:Coherence(spatial,temporal).;Divergenceoflaserbeamissmall.;Polarization.;Laseremitsmonochromaticwave.Usuallylaseremitssinglewavelength.;Stimulatedemission.Theonethatcanexplaintheexperimentalcurveofblackbodyradiationperfectlyis()
A:theRiley-PierceequationB:Einstein'sformulaC:Wien'sformulaD:Planck'sformula
答案:Planck'sformulaAconcavecavitywithaconcavemirrorofradiusRequaltothecavitylengthLisa().
A:StabilizingcavityB:UncertainC:unsteadycavityD:Criticalcavity
答案:CriticalcavityThewavelengthoftheCO2laseris()
A:1064nmB:10.6μmC:335nmD:810nm
答案:10.6μmThebasicstructureofthelaserconsistsofelectricalworkingmatter,pumpsourceand()threeparts.
A:OpticalresonantcavityB:ReflectorC:AffectedpoleD:Windowmirror
答案:OpticalresonantcavityCarbondioxidelaserscommonlyusedgasmixturecompositioniscomposedof(),helium,argon,nitrogen.
A:NeongasB:CarbondioxideC:CarbonmonoxideD:Oxygen
答案:Carbondioxide
第二章單元測試
Whattypeoflaserdoesthecarbondioxidelaserbelongto?()
A:GaslaserB:FiberlaserC:Solid-statelaserD:Semiconductorlaser
答案:GaslaserWhenthepulseenergyiscertain,thenarrowerthepulsewidth,itmeansthetimeenergydensitywithtimeasthedenominator().
A:thesmallerB:UncertainC:ThegreaterD:Constant
答案:ThegreaterForauniformlybroadenedmedium,thesmall-signalgaincoefficientatthecentercenterfrequencyisG0(v0),andwhenI=Is,saturationissignificant,andthenon-small-signalcenter-frequencygaincoefficientis:().
A:B:C:D:
答案:Thefollowingstatementabouttheelectricfieldinductionformulaiscorrect()。
A:P(z,x,y,t)ispolarizationofamediumB:ε(z,x,y,t)isdielectricpermittivityC:E(z,x,y,t)iselectricfieldstrengthD:all
答案:allWhatistheDuffing’sequationusedtocalculateelectrondisplacement?()
A:B:C:D:
答案:Thethresholdconditionistheformationoflaser()。
A:sufficientnecessarycondition.B:sufficientcondition.C:necessarycondition.D:Indeterminate.
答案:sufficientnecessarycondition.Whenalaserpropagatesfromonemediumtoanotherwithadifferentrefractiveindex,a(C)willappearattheinterfacebetweenthemedia()。
A:ReflectionandrefractionB:NeitherC:RefractionD:Reflections
答案:ReflectionandrefractionThecollisionalbroadeningspectrallineis()。
A:ParabolictypeB:HyperbolictypeC:LorentzianlinearD:Gaussianlinetype
答案:LorentzianlinearParticlenumberreversaldistributionstatemicroscopicparticlessatisfy()
A:FermidistributionB:GaussiandistributionC:BormanzdistributionD:Negativetemperaturedistribution
答案:NegativetemperaturedistributionAtacertaintemperature,theoddsofspontaneousradiationare()timesgreaterthantheoddsofexcitedradiation
A:B:C:D:
答案:
第三章單元測試
TheDopplerbroadeningoftheCO2spectrallineis53MHz,andtheextremevalueofthespectrallinefunctioncorrespondingtothecentralfrequencyis()。
A:1.7×109HzB:1.7×10HzC:1.7×10-9sD:1.7×10-9Hz
答案:1.7×10-9sQ-modulatedlaserscanusuallyobtain()magnitudeshortpulses.
A:nsB:fsC:msD:μs
答案:nsRubylaserisatypical()system。
A:ThreeenergylevelB:DienergylevelC:Multi-energylevelD:Four-energylevel
答案:ThreeenergylevelDopplerbroadeninghasoccurredin()media.
A:IsolatesB:SolidsC:liquidsD:liquids
答案:liquidsHe-Nelasersbelongtothetypical()system.
A:twoenergylevelsB:multi-energylevelC:threeenergylevelsD:fourenergylevels,
答案:fourenergylevels,Thecharacteristicsoflasercavityoscillationmodeare()。
A:Thedivergenceangleofthelaserbeamforeachmode.B:Thesimpleharmonicfrequencyofthemode.C:Theelectromagneticfieldtheoryofthemode.D:Therelativepowerlossexperiencedbythemodeduringoneroundtripinthecavity.
答案:Thedivergenceangleofthelaserbeamforeachmode.;Thesimpleharmonicfrequencyofthemode.;Theelectromagneticfieldtheoryofthemode.;Therelativepowerlossexperiencedbythemodeduringoneroundtripinthecavity.Forthesamemedium,thesmallsignalgaincoefficientvarieswith()。
A:ExcitationpowerB:SpontaneousradiationchanceC:particlenumberdensityD:Spectrallinewidth
答案:ExcitationpowerNaturalbroadeningiscausedby().
A:collisionsofparticlesB:excitedstateshaveacertainlifetimeC:theDopplereffectD:vibrationofparticles
答案:excitedstateshaveacertainlifetimeTheresonantfrequencyofthelongitudinalmodeoftheresonantcavityis()。
A:B:C:D:
答案:Symmetricconfocalcavitybasemodelightwaistfor()。
A:B:C:D:
答案:
第四章單元測試
TherelationshipbetweentheEinsteincoefficientofspontaneousradiationandtheaveragelifetimeτoftheexcitedstateE2is()。
A:B:C:D:
答案:Th
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