大学物理（下）（College Physics II）知到智慧树章节测试课后答案2024年秋重庆大学

大学物理（下）（CollegePhysicsII）知到智慧树章节测试课后答案2024年秋重庆大学第一章单元测试

Acharge+Qisfixedinpositionasasmallcharge+qisbroughtnearitandreleasedfromrest.Whichbestdescribesthemagnitudeofthevelocityofthecharge+qasr,thedistancebetweenthechargesincreases?()

A:Themagnitudeofthevelocitywilldecrease,anditsrateofdecreasewillalsodecrease.

B:Themagnitudeofthevelocitywillincrease,anditsrateofincreasewillalsoincrease.

C:Themagnitudeofthevelocitywillincrease,butitsrateofincreasewilldecrease.

D:Themagnitudeofvelocitywillincrease,butitsrateofdecreasewillincrease.

E:Themagnitudeofthevelocitywillremainconstant.

答案:Themagnitudeofthevelocitywillincrease,butitsrateofincreasewilldecrease.

Themotionoflargebodiesatgreatdistancesisgovernedprimarilybygravityandnotbytheelectrostaticforcebecause()

A:theelectrostaticforceisfeltonlyovershortdistances

B:theelectrostaticforceiscanceledoutbythemagneticforce

C:oftherelativescarcityofantiparticles

D:themajorityofmatteriselectricallyneutral

E:gravityisamuchstrongerforcethantheelectrostaticforce

答案:themajorityofmatteriselectricallyneutral

Anobjectwithachargeof–2qfeelsaforceofFwhenputatapointPinanelectricfield.IntermsofFandq,thestrengthoftheelectricfieldatthispointis().

A:

B:

C:2qF

D:

E:

答案:

AllofthefollowingaretrueaboutGauss'lawEXCEPT()

A:Gauss'lawreferstothefluxthroughaclosedsurface.

B:Gauss'lawisusefulwhentheelectricfieldiszero.

C:Gauss'lawisusefulwhentheelectricfieldisperpendiculartothedifferentialarea.

D:Gauss'lawstatesthatthefluxthroughtheclosedsurfaceisproportionaltothetotalchargewithinthesurface.

E:ArectangleisanexampleofaGaussiansurface.

答案:ArectangleisanexampleofaGaussiansurface.

BasedonGauss'Law,whichofthefollowingaffectstheelectricfluxthroughaGaussiansurface?()

A:astationaryelectricchargeoutsidethesurface

B:astationaryelectricchargeenclosedbythesurface

C:amagneticmonopoleenclosedbythesurface

D:achargemovingwithaconstantvelocityoutsidethesurface

E:amagneticdipoleoutsideofthesurface

答案:astationaryelectricchargeenclosedbythesurface

WhichofthefollowingpairsofchargedistributionsandGaussiansurfacesarecorrectlypairedsuchthattheGaussiansurfacecanbeusedtofindtheelectricfieldassociatedwiththatchargedistribution?()

A:planeandsphere

B:infinitelineandsphere

C:planeandcylinder

D:infinitelineandrectangle

E:planeandrectangle

答案:planeandcylinder

IftheelectricfielddoespositiveworkonanegativechargeasthechargeundergoesadisplacementfrompointAtopointBwithinanelectricfield,thentheelectricalpotentialenergy()

A:decreases.

B:isnegative.

C:ispositive.

D:electricfieldscannotdowork.

E:increases.

答案:decreases.

Thenegativederivativeofelectricpotentialwithrespecttoradiusisequalto（）

A:electricfield

B:electricforce

C:potentialenergy

D:charge

E:capacitance

答案:electricfield

Thepotentialdifferenceduetoafiniterodalongthex-axisisgivenbytheequationV(x)=C[ln(x+L)–ln(x)],whereCandLareconstants.Whatistheelectricfieldduetothisrod?（）

A:

B:

C:

D:

E:

答案:

PointAisadistanceLtotheleftofachargeQ.PointBisa

distance3LtotheleftofpointA.Iftheelectricfieldat

pointAduetochargeQisE,whatistheelectricfieldat

pointB?

A:E/9B:EC:E/3D:3EE:E/16

答案:E/16

A:B:C:D:E:

答案:Twosolidspheres,bothofradius5cm,carryidenticaltotalchargesof2nC.SphereAisagoodconductor.SphereBisaninsulator,anditschargeisdistributeduniformlythroughoutitsvolume.Howdothemagnitudesoftheelectricfieldstheyseparatelycreateataradialdistanceof6cmcompare?

A:B:C:D:E:

答案:

A:B:C:D:E:

答案:

A:B:C:D:E:

答案:

第二章单元测试

Twochargedconductingspheresaretouchedtogether.Chargeflowsbetweenthemuntilwhichofthefollowingisthesameforbothspheres?()

A:electricpotential

B:totalenergy

C:totalcharge

D:electricfieldatthesurface

E:electricfieldatthecenter

答案:electricpotential

Anunchargedmetalsphereisplacedwithinauniformelectricfield.Whichofthefollowingistrueaboutthenetforceandtorqueonthesphere?（）

A:Thenetforceisagainstthedirectionofthefield,andthenettorqueisagainstthedirectionofthefield.

B:Thenetforceisinthedirectionofthefield,andthenettorqueisinthedirectionofthefield.

C:Thenetforceiszeroandthenettorqueisinthedirectionofthefield.

D:Thenetforceandnettorquearebothzero.

E:Thenetforceiszeroandthenettorqueisagainstthedirectionofthefield.

答案:Thenetforceandnettorquearebothzero.

Asolidsphereconsistsofametalcore,anon-conductingmiddleshell,andametaloutershell.Ifapositivechargeisplacedonthecore,whereinthespherewillanetpositivechargebefound?()

A:ontheoutersurfaceoftheoutershell

B:evenlydistributedthroughoutthetwometalregions

C:evenlydistributedthroughoutthecore

D:onboththeoutersurfaceofthecoreandtheoutersurfaceoftheoutershell

E:ontheoutersurfaceofthecore

答案:onboththeoutersurfaceofthecoreandtheoutersurfaceoftheoutershell

Twoconductingspheresofdifferentradiieachcarryacharge+Q.Whichofthefollowingoccurswhenthetwospheresaretouchedtogether?()

A:Positivechargeflowsfromthesmallerspheretothelargersphereuntiltheelectricfieldatthesurfaceofeachsphereisthesame.

B:Nochargeflows.

C:Positivechargeflowsfromthelargerspheretothesmallersphereuntiltheelectricpotentialatthesurfaceofeachsphereisthesame.

D:Positivechargeflowsfromthesmallerspheretothelargersphereuntiltheelectricpotentialatthesurfaceofeachsphereisthesame.

E:Positivechargeflowsfromthelargerspheretothesmallersphereuntiltheelectricfieldatthesurfaceofeachsphereisthesame.

答案:Positivechargeflowsfromthesmallerspheretothelargersphereuntiltheelectricpotentialatthesurfaceofeachsphereisthesame.

Threeidenticalmetalspheresaremountedoninsulatingstands.Initially,sphereAhasanetchargeofqandspheresBandCareuncharged.SphereAistouchedtosphereBandremoved.ThensphereAistouchedtosphereCandremoved.WhatisthefinalchargeonsphereA?()

A:q/4

B:q/3

C:q/2

D:q

E:q/6

答案:q/4

Aparallel-platecapacitorhascapacitanceC.Asecondparallel-platecapacitorhasplateswithtwicetheareaandhalftheseparation.Thecapacitanceofthissecondcapacitorismostnearly（）

A:C/4

B:C/2

C:4C

D:2C

E:C

答案:4C

AllofthefollowingaretrueaboutsphericalcapacitorsEXCEPT()

A:Theelectricfieldoutsidetheoutersphereiszero

B:Theelectricfieldpointsradiallytowardsthecenterofthespheres

C:Thecapacitanceisequaltothechargedividedbythepotentialdifference

D:Theelectricfieldbetweenthetwospheresisdeterminedonlybythechargeontheoutersphere

E:Thepotentialdifferencebetweenthetwospheresisthenegativeintegraloftheelectricfield

答案:Theelectricfieldbetweenthetwospheresisdeterminedonlybythechargeontheoutersphere

Abatteryisattachedtoseveraldifferentcapacitorsconnectedinparallel.Whichofthefollowingstatementsistrue?（）

A:Allcapacitorshavethesamecharge,andtheequivalentcapacitanceisgreaterthanthecapacitanceofanyofthecapacitorsinthegroup.

B:Thepotentialdifferencesacrossthecapacitorsarethesameonlyifthecapacitancesarethesame.

C:Thepotentialdifferenceacrosseachcapacitoristhesame,andtheequivalentcapacitanceisgreaterthananyofthecapacitorsinthegroup.

D:Thecapacitorwiththesmallestcapacitancecarriesthelargestcharge.

E:Thecapacitorwiththelargestcapacitancecarriesthesmallestcharge.

答案:Thepotentialdifferenceacrosseachcapacitoristhesame,andtheequivalentcapacitanceisgreaterthananyofthecapacitorsinthegroup.

Aparallel-platecapacitorisconnectedtoabattery.Whathappenstothestoredenergyiftheplateseparationisdoubledwhilethecapacitorremainsconnectedtothebattery?（）

A:Itremainsthesame.

B:Itincreasesbyafactorof4.

第三章

C:Itisdoubled.

D:Itdecreasesbyafactorof4.

E:Itdecreasesbyafactorof2.

答案:Itdecreasesbyafactorof2.

A:0.0036JB:0.06JC:0.03JD:18JE:9J

答案:18J

第三章单元测试

Aparticlewithelectricchargeisfiredintoaregionofspacewheretheelectricfieldiszero.Itmovesinastraightline.Canyouconcludethatthemagneticfieldinthatregioniszero?()

A:Yes,youcan.

B:No;anobservationofanobjectwithelectricchargegivesnoinformationaboutamagneticfield.

C:No;thefieldmightbeperpendiculartotheparticle’svelocity.

D:No;thefieldmightbeparalleltotheparticle’svelocity.

E:No;theparticlemightneedtohavechargeoftheoppositesigntohaveaforceexertedonit.

答案:No;thefieldmightbeparalleltotheparticle’svelocity.

Whichofthefollowingexplainswhyamagneticfielddoesnoworkonamovingchargedparticle?()

A:Themagneticforceisalwaysperpendiculartothedirectionofmotion.

B:Thereisalwaysanelectricfieldthatcancelstheworkdonebythemagneticfield.

C:Themagneticforcedependsonthespeedoftheparticle.

D:Themagneticforcedependsonthedirectionofmotionoftheparticle.

E:Themagneticforceisconservative.

答案:Themagneticforceisalwaysperpendiculartothedirectionofmotion.

TwolongparallelwiresarefixedatadistancedapartandeachcarryacurrentofI.TheforceofattractionbetweenthemisF.Ifthedistancebetweenthewiresisdoubledandthecurrentineachofthewiresisdoubled,whatisthenewforceofattractionbetweenthewires?()

A:4F

B:2F

C:F/4

D:F/2

E:F

答案:2F

TheBiot-SavartLawisusedto（）

A:determinetheelectricfieldcreatedbyindividualpointcharges

B:determinetheelectricfieldcreatedbyanelectriccurrent

C:determinetheforcefieldcreatedbyanelectriccurrent

D:determinethemagneticfieldcreatedbyindividualpointcharges

E:determinethemagneticfieldcreatedbyanelectriccurrent

答案:determinethemagneticfieldcreatedbyanelectriccurrent

Iftwocurrentcarryingwiresexertaforceof50Noneachother,whatforcewilltheyfeelifthedistancebetweenthemishalved?()

A:25N

B:100N

C:50N

D:12.5N

E:200N

答案:100N

WhichofthefollowingisnotusedwhenapplyingAmpere'slaw?()

A:alineintegral

B:alengthdifferential

C:magneticfield

D:asurfaceintegral

E:adotproduct

答案:asurfaceintegral

Aninfinitelylargecurrent-carryingsheetliesonthexy-planecarryingcurrentinthey-direction.Whichofthefollowingisfalseaboutthemagneticfieldthatitcreates?()

A:Themagneticfielddependsonthedistanceawayfromtheplane.

B:Themagneticfieldisinthepositivex-direction.

C:Themagneticfielddependsonthecurrentdensityinthesheet.

D:ThemagneticfieldcanbecalculatedusingAmpere’slaw.

答案:Themagneticfielddependsonthedistanceawayfromtheplane.

A:B:C:D:E:

答案:

A:0.3125VB:0.02VC:3.125VD:0.002V

答案:0.002VThereisaclockwisecurrentinacircularloopofwireinanexternalmagneticfielddirectedoutofthepageasshowninthediagram.Theeffectofthemagneticfieldistomaketheloop

A:expand.B:contract.C:rotateperpendicularlytothepage.D:rotateintheplaneofthepage.E:moveintothepage

答案:contract.WhatisthemagneticfieldatpointPduetothesegmentofwireABcarryingcurrentI?

A:B:C:D:E:

答案:

A:(BI–l/2)+mgB:g+lBC:mg+IBlD:mg–IBlE:mg–IB/2

答案:mg–IBl

第四章单元测试

Themagneticfieldfromaloopofcurrentcarryingwireintheplaneofthepageisdirectedoutofthepage.Inwhichdirectiondotheelectronsinthewireloopmove?()

A:clockwise

B:theyallmovetotherightsideoftheloop

C:theyarestationary

D:counterclockwise

E:theyallmovetotheleftsideoftheloop

答案:clockwise

Amagneticfieldthatisincreasingwithtimeisdirectedoutofthepageandpassesthroughacircularloopofwireintheplaneofthepage.Whichofthefollowingistrue?()

A:Thereisaninducedcurrentintheloopthatisclockwiseindirection.

B:Thereisaninducedcurrentintheloopthatiscounterclockwiseindirection.

C:Theloopwillrotateaboutadiameter.

D:Nochangewilloccurintheloop

E:Theloopwillrotateaboutanaxisperpendiculartotheplaneofthepage.

答案:Thereisaninducedcurrentintheloopthatisclockwiseindirection.

Lenz'sLawindicateswhichofthefollowing?()

A:Therearenomagneticmonopoles.

B:Lightincidentonaconcavemirrorproducesavirtualimage.

C:Theforceexertedbyamagneticfieldisperpendiculartoboththemotionofthechargedparticleandthedirectionofthemagneticfield.

D:

E:TheinducedEMFproducesamagneticfieldthatopposesthechangethatproducedtheEMF:TheinducedEMFisequaltothechangeinmagneticflux.

答案:TheinducedEMFproducesamagneticfieldthatopposesthechangethatproducedtheEMIfthemagneticfieldBthroughaloopofwireisdecreasing,theinducedmagneticfieldwillbe()

A:intheoppositedirectionofB

B:thereisnoinducedmagneticfield

C:inthesamedirectionasB

D:atanacuteangletoB

E:perpendiculartoB

答案:inthesamedirectionasB

Along,finewireiswoundintoacoilwithinductance5mH.Thecoilisconnectedacrosstheterminalsofabattery,andthecurrentismeasuredafewsecondsaftertheconnectionismade.ThewireisunwoundandwoundagainintoadifferentcoilwithL=10mH.Thissecondcoilisconnectedacrossthesamebattery,andthecurrentismeasuredinthesameway.Comparedwiththecurrentinthefirstcoil,isthecurrentinthesecondcoil()

A:one-fourthaslarge

B:fourtimesaslarge

C:twiceaslarge

D:unchanged

E:halfaslarge

答案:unchanged

Whichofthefollowingcircuitelementstoresenergyintheelectromagneticfield?()

A:Condenser

B:Resistance

C:Variableresistor

D:Inductor

答案:Inductor

Astraightrodoflength3.0misheldperpendiculartoamagneticfieldof2.0T.Itisrotatedaboutitsmidpointatarateof5.0revolutionspersecond,remainingperpendiculartothefieldtheentiretime.Theemfgeneratedintherodismostnearly()

A:94.2V

B:141V

C:22.5V

D:70.7V

E:45V

答案:141V

Acircularloopofwirewitharadiusof5

cmrotatesclockwiseataconstantangularvelocitythrough

amagneticfieldB=5T.Theplaneoftheloopgoesfrom

beingperpendiculartothefieldtobeingata45ºanglewith

thefieldin0.25s.

Theaverageemfinducedintheloopwillbe

A:0.092VB:0.023VC:0.012VD:0VE:0.046V

答案:0.046VThediagramshowsawireloopinauniform

magneticfieldBthatpointsoutofthepage.Inwhichway

shouldtheloopbemovedtoinduceacurrentwithinthe

loop?

A:Currentcannotbeinducedintheloopbecausethe

magneticfieldisuniformB:Alongthey-axiswithconstantvelocityC:Alongthex-axiswithincreasingvelocityD:Alongthez-axiswithconstantvelocityE:Rotatetheloopaboutthez-axis

答案:Alongthex-axiswithincreasingvelocityInthediagrambelow,asegmentofwire,RS,whichis0.20

minlength,isfreetoslidealongaU-shapedwirelocated

inauniform0.60-Tmagneticfielddirectedintothepage.

IfwiresegmentRSisslidtotherightataconstantspeedof

4.0meterspersecond,thepotentialdifferenceinduced

acrosstheendsofthewiresegmentis

A:0.48VB:1.2VC:4.8VD:2.4VE:0.12V

答案:0.48V

第五章单元测试

Thepositionofa0.64-kgmassundergoingsimpleharmonicmotionisgivenbyx=(0.160m)cos(πt/16).Whatisitspositionatt=5.0s?()

A:0.089m

B:0.160m

C:0.159m

D:0.113m

E:0.076m

答案:0.089m

Ifanobjectofmassmattachedtoalightspringisreplacedbyoneofmass9m,thefrequencyofvibratingsystemchangesbywhatmultiplicationfactor?()

A:6.0

B:1/3

C:9.0

D:1/9

E:3.0

答案:1/3

Whichofthefollowingstatementsaboutaspring-blockoscillatorinsimpleharmonicmotionaboutitsequilibriumpointisfalse?()

A:Thedisplacementisdirectlyrelatedtotheacceleration.

B:Theaccelerationvectorisalwaystowardtheequilibriumpoint.

C:Theaccelerationandvelocityvectorsalwayspointinthesamedirection.

D:Theaccelerationanddisplacementvectorsalwayspointinoppositedirections.

答案:Theaccelerationandvelocityvectorsalwayspointinthesamedirection.

Anobject-springsystemmovingwithsimpleharmonicmotionhasanamplitudeA.whenitskineticenergyequalstwicethepotentialenergystoredinthespring,whatisthepositionxoftheobject?()

A:0

B:someothervalue

C:A

D:A/3

E:A/√3

答案:A/√3

Supposea0.3-kgmassonaspringthathasbeencompressed0.10mhaselasticpotentialenergyof1.0J.Howmuchfurthermustthespringbecompressedtotripletheelasticpotentialenergy?()

A:0.17m

B:0.05m

C:0.20m

D:0.07m

E:0.30m

答案:0.07m

Triplingthemassofthebobonasimplependulumwillcauseachangeinthefrequencyofthependulumswingbywhatfactor?()

A:9.0

B:3.0

C:0.33

D:1.0

E:12

答案:1.0

Youstandontheendofadivingboardandbouncetosetitintooscillation.Youfindamaximumresponseintermsoftheamplitudeofoscillationoftheendtheboardwhenyoubounceatfrequencyf.Younowmovetothemiddleoftheboardandrepeattheexperiment.Theresonancefrequencyforforcedoscillationsatthispointwill()

A:decrease

B:increase

C:bethesameasf

D:beunabletodetermine

答案:increase

Foramasssuspendedonaspringintheverticaldirection,thetimeforonecompleteoscillationwill

dependon:

A:thedistancethemasswasoriginallypulleddown.B:thetimedoesn'tdependonthevaluefor

g

or

themaximumspeedoftheoscillatingmass.C:thevaluefor

g

(theaccelerationduetogravity).D:themaximumspeedoftheoscillatingmass.E:boththevaluefor

g

and

themaximumspeedoftheoscillatingmass.

答案:thetimedoesn'tdependonthevaluefor

g

or

themaximumspeedoftheoscillatingmass.Amassonaspringvibratesinsimpleharmonicmotionatafrequencyof4.0Hzandanamplitudeof

4.0cm.Ifatimerisstartedwhenitsdisplacementisamaximum(hencex=4cmwhent=0),whatis

theaccelerationmagnitudewhent=3s?

A:B:C:D:E:

答案:

第六章单元测试

Atransversewavetravelsalongthex-axis.Theparticlesofthemediummustmove()

A:Inthey-zplane

B:Alongthey-axis

C:Alongthez-axis

D:Alongthex-axis

答案:Inthey-zplane

Whichofthefollowingarelongitudinalwaves?()

A:Surfacewaterwavesonthelake

B:Radiowavessentoutfromthebroadcastingstation

C:Soundwavesproducedbythevibratingstringoftheguitar

D:Lightraysfromthesun

答案:Soundwavesproducedbythevibratingstringoftheguitar

Whichofthefollowingcharacteristicofawaveisindependentoftheothers?()

A:wavelength

B:frequency

C:amplitude

D:speed

答案:amplitude

Assumeachangeatthesourceofsoundreducesthewavelengthofasoundwaveinairbyafactorof2.Whathappenstoitsfrequency?()

A:Itincreasesbyafactorof2.

B:Itisunchanged.

C:Itdecreasesbyafactorof2

D:Itincreasesbyafactorof4.

答案:Itincreasesbyafactorof2.

Whichofthefollowingfunctionsrepresentatravelingwave?()

A:noneofotherchoices

B:y=1/(rt−qx)

C:y=pcos(rt−qx)

D:y=pcos(qx)sin(rt)

答案:y=1/(rt−qx)

Asourcevibratingatconstantfrequencygeneratesasinusoidalwaveonastringunderconstanttension.Ifthepowerdeliveredtothestringisdoubled,bywhatfactordoestheamplitudechange?()

A:2

B:4

C:0.707

D:√2

E:cannotbepredicted.

答案:√2

Astandingwaveissetupina200-cmstringfixedatbothends.Thestringvibratesin5distinctsegmentswhendrivenbya120-Hzsource.Whatisthewavelengthofthestandingwave?()

A:40cm

B:100cm

C:10cm

D:20cm

E:80cm

答案:80cm

A:B:C:D:E:

答案:

第七章单元测试

Whenlightpassesfromamaterialwithahighindexofrefractionintomaterialwithalowindexofrefraction:()

A:noneofthelightisreflected.

B:somelightisreflectedwithoutachangeofphase.

C:thelightthatisnotreflectedhasa180°changeofphase.

D:somelightisreflectedwitha180°changeofphase.

答案:somelightisreflectedwithoutachangeofphase.

Twolightsourcesaresaidtobecoherentifthey()

A:areofthesamefrequency,andmaintainaconstantphasedifference.

B:areofthesamefrequencyandamplitude.

C:areofthesamefrequency.

D:areofthesameamplitude,andmaintainaconstantphasedifference.

答案:areofthesamefrequency,andmaintainaconstantphasedifference.

Coherentlightofasinglefrequencypassesthroughadoubleslitwithaseparationd,toproduceapatternonascreenasdistanceDfromtheslits.Whatwouldcausetheseparationbetweenadjacentminimaonthescreentoincrease?()

A:increasethefrequencyoftheincidentlight

B:increasetheindexofrefractionofthemediuminwhichthesetupisimmersed

C:increasetheseparationdbetweentheslits

D:increasethedistance

答案:increasethedistance

Aplanemonochromaticlightwaveisincidentonadoubleslitsystem.Astheviewingscreenismovedawayfromthedoubleslit,whathappenstotheseparationbetweentheinterferencefringesonthescreen?()

A:Itremainsthesame.

B:Itdecreases.

C:Itmayincreaseordecrease,dependingonthewavelengthofthelight.

D:Itincreases.

E:Moreinformationisrequired.

答案:Itincreases.

Greenlighthasawavelengthof500nminair.Thegreenlightisreflectedperpendicularlyfromathinfilmofaplasticwithanindexofrefraction2.00.Thefilmappearsbrightinthereflectedlight.Howmuchadditionalthicknesswouldmakethefilmappeardark?()

A:62.5nm

B:125nm

C:500nm

D:1,000nm

E:250nm

答案:62.5nm

Interferencepatternisobservedinwedge-shapedfilmandfringewidthisnoted.Nowtheangleofwedgeisreduced.Whatwillbetheeffectonfringewidth?()

A:Therewillnotanyeffect

B:Fringewidthwilldisappear

C:Fringewidthincreases

D:Fringewidthdecreases

答案:Fringewidthincreases

ThecenterspotofNewton'sringsisdark.Thisdestructiveinterferenceoccursbecause:()

A:thetwobeamstraveldistancesthataredifferentbyhalfawavelength.

B:bothwaveshaveatrough.

C:bothwaveschangephaseby180°astheyarereflected.

D:onebeamchangesphaseby180°whenitisreflected.

答案:onebeamchangesphaseby180°whenitisreflected.

A:404nmB:212nmC:500nmD:285nmE:313nm

答案:212nm

A:Thedarkcirclechangesintoabrightcircle,thenintoadarkcircle,andthenintoabrightcircle.B:Thedarkcirclechangesintoabrightcircle.C:Thedarkcirclechangesintoabrightcircleandthenbackintoadarkcircle.D:Thereisnochangeinthepattern.

答案:Thereisnochangeinthepattern.Newtonsringsexperimentisperformedandradius(ordiameter)iscalculated.NowPlano-convexlensisreplacedwithanotherPlano-convexlensofgreaterRadiusofcurvature.Whatwillbeeffectonradius(ordiameter)?

A:TherewillbenoeffectB:Radius(ordiameter)willdecreaseC:Radius(ordiameter)willremainconstantbuttherewillbemorebrightnessD:Radius(ordiameter)willincrease

答案:Radius(ordiameter)willincreaseInthinfilmofwedgeshaped,bykeepingallotherparametersconstant,ifonlywavelengthofincidentlightisincreased.Whatwillbetheeffectonbandwidth?

A:Therew