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在“探究光折射时的特点”试验中,让光源发出的一束光从水中以不同的角度射入空气,观察到光束在水中和空气中的径迹如图所示.回答以下问题:(1)此现象说明 (选填序号)A.光路可逆B.光在水面只发生了...
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由两个不同光源所发出的两束白光落在同一点上不会产生干涉现象这是因为
两个光源的光速不同
两个光源发出光的强度不同
两个光源发出光的频率不同
这两个光源是彼此独立的,不是相干光源
水中某一深处有一点光源S.可以发出ab两种单色光其由水中射出水面的光路如图1所示关于这两种单色光性质
a光的频率比b光的小
a光的折射率比b光的大
a光在水中的传播速度比b光的小
a光在水中的波长比b光的小
如图所示水下光源S.向水面
点发射一束光线,折射光线分成a、b两束,则( ) A.a、b两束光相比较,a光的折射率较大
若b光束恰好能使某金属发生光电效应,则a也能
若保持入射点A.位置不变,将入射光线顺时针旋转,则从水面上方观察,b光先消失
采用同一双缝干涉实验装置,分别以a、b光做光源,a光的干涉条纹间距小于b光的干涉条纹间距
如图所示两束单色光ab射向水面A点经折射后组成一束复色光则
在水中a光的速度比b光的速度小
以水下S点为光源向水面发射复色光,a光更容易发生全反射
用同一双缝干涉实验装置做实验,a光的干涉条纹间距大于b光的间距
若a.b两束光的入射角均增加相同角度,经水的折射后仍能组成一束复色光
如图所示水下光源S.向水面
点发射一束光线,折射光线分别为a、b两束。则( )A.a,b两束光相比较,在真空中a光的波长较长
在水中a光的速度与b光的一样大
若保持入射点A.位置不变,将入射光线顺时针旋转,从水面上方观察,a光先消失,
用同一双缝干涉实验装置分别用a,b光做实验,a光干涉相邻条纹间距小于b光干涉条纹间距
一束光从水中斜射到水中和空气的界面时同时发生了反射和折射请作出反射光和折射光的大致方向.
一束光由空气射入水中则
折射光线和入射光线一定在法线的同侧
折射角一定小于入射角
光的传播方向一定发生偏折
光的传播速度一定发生改变
如图所示由点光源S发出的一束光AB射到镜面MN上CD是由S发出的另一束入射光的反射光请在图中画出点
如左下图所示光源S发出的一束光经墙上的平面镜反射后照射在水面上的A点折射进入水中.请画出它经平面镜
一光源S.发出一束光从水中射向空气请利用平面镜成像的特点画出反射光线并标出反射角
一束光AO从空气斜射入水中发生折射请在图14中画出折射光线OB的大致位置
在探究光的折射规律时小明让一束光从空气斜射如玻璃水槽内的水中看到如图2所示的现象请在图中分别作出入射
一束光线从水中射向空气的光路如图所示这束光线在水与空气的界面时发生了反射与折射则入射光线是折射光线是
一光源发出的一束光从地面上竖直向上投射到和它垂直的平面镜上平面镜与地面距离为3米如果把平面镜绕水平轴
如图所示水下光源S.向水面
点发射一束光线,折射光线分别为a、b两束。则( ) A.在水中a光的速度与b光的一样大
a、b两束光相比较,在真空中a光的波长较长
若保持入射点A.位置不变,将入射光线顺时针旋转,从水面上方观察,a光先消失
用同一双缝干涉实验装置分别用a、b光做实验,a光干涉相邻条纹间距小于b光干涉相邻条纹间距
一束光线从空气中斜射入某透明物质中入射光线与法线的夹角是30°那么反射角的大小是__________
如图所示水下光源S.向水面
点发射一束光,折射光分成a、b两束,则( )
A. a、b两束光相比较,a光的折射率较大
a、b两束光相比较,a光在水中的传播速度较大
若保持入射点A.位置不变,将入射光线顺时针旋转,则从水面上方观察,b光先消失
采用同一双缝干涉实验装置,分别以a、b光做光源,a光的干涉条纹间距小于b光的干涉条纹间距
一束光线从水中射向空气的光路如图所示这束光线在水与空气的界面时发生了反射与折射则入射光线是折射光线是
用光子能量为E.的一束单色光照射处于基态的一群氢原子这群氢原子吸收光子后能发出6种不同频率的光在这6
频率最低的光,频率是E./h
光子能量最小的光,频率是E./h
在真空中波长最大的光,波长是ch/E
频率为E./h的光在水中的折射率最大
一光源发出的一束光从地面上竖直向上投射到和它垂直的平面镜上平面镜与地面距离为3米如果把平面镜绕水平轴
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编号为23456的乒乓球放在不透明的袋内从中任抽一个球抽中编号是偶数的概率是.
30分IhadjustarrivedinthisAsiancountryforaone﹣yearteachingposition.OnedayItookthesubwaytovisitsomeancientpalacesandtemplesinthedowntown.Thefollowingaccountofwhathappenedtomehastaughtmemuchaboutculture36. Sinceallthe37weretakenIstood.SuddenlyIfeltsomeonepullingonmybag.38Iprobablywasinsomeone'swayImovedoverslightly.Butinonequickmotion动作Ifeltmybagremovedfrommybackandinaflashitwas39.Iturnedaroundtoseewhothethiefwas.Ilookedatthepeoplestandingbehindmebutdidn'tseemybagoranyone40.MyheartsankandIbeganto41. Iglancedaroundthecaronlytofinddirectlyacrossfrommewasanelderlyladyandsittingonherlapwasmy42.Itriedtogetitbackfromherlap.ButasIbeganto43itupshequicklygrabbed抓住itbackandheldontoit.Ilookedaroundatthepeoplestandingbesidemeandthosesittingbesideherbutnoonetookany44ofthesituation.Tryingnottocauseaan45Itriedtonegotiatethroughgestures.IusedmyhandsasbestasIcouldbutshe46myrequestsformybagandpointedtomyback.Shepickedupmybagshowinghow47itwas.Ifinallybegantounderstand.Shewasholdingmybagto48me. Atthenextstopamiddle﹣agedwomangotonthecrowdedsubway.Anotherelderlywomansittingdowntookherbag49itonherlap.Theydidn'ttalk50thisolderwomanwasmorethanpleasedtositwiththisstranger'sbagonherlapthroughoutherjourney. AsthesubwaypulledintothemaindowntownstationandIwasgettingreadytogetoffthewoman51handedmebackmybag.But52Ihadachancetothankhershehaddisappearedintothecrowd. Sadlythisconsideratecustomwasmore53tomethanifIhadbeenrobbed.Everyonebackhomehadheardofbeingrobbed﹣thatwas54citybehavior﹣buthavingastrangerholdontosomeone'sbagoutof55inacityoftwelvemillionpeople﹣thatwastrulyunusual. 36.A.loss B.aim C.cause D.difference 37.A.cars B.seats C.buses D.stations 38.A.Deciding B.Assuming C.Admitting D.Expecting 39.A.broken B.emptied C.opened D.gone 40.A.suspicious B.nervous C.cautious D.dangerous 41.A.panic B.scream C.leave D.regret 42.A.book B.bag C.money D.map 43.A.pull B.bring C.check D.wrap 44.A.advantage B.charge C.notice D.photo 45.A.attack B.scene C.accident D.change 46.A.received B.handled C.considered D.ignored 47.A.small B.useful C.heavy D.special 48.A.remind B.tease C.help D.warn 49.A.dropping B.tapping C.closing D.setting 50.A.yet B.so C.or D.because 51.A.angrily B.gratefully C.anxiously D.gently 52.A.until B.once C.before D.while 53.A.amusing B.surprising C.annoying D.disappointing 54.A.usual B.harmful C.practical D.suitable 55.A.curiosity B.pity C.kindness D.desperation
8分IfithadnetbeenforFanJinshiandherteamthewordculturalheritageatDunhuangMogaoGrottoesinaremoteChinesedesertmighthavelongbeendestroyedbysandweatherorhumans. BornandraisedinShanghaiFanhasspenthalfacenturyfightinganuphillbattletopreservetheancientBuddhistwallpaintingsatDunhuanginNorthwestChina'sGansuprovinceThe1600﹣year﹣oldDunhuangMogaoGrottoesareahugecollectionofBuddhistart﹣﹣morethan2000Buddhafiguresand45000squaremetersofpaintingsspreadamong735caves.ItisChina'sfirstUNESCOWorldHeritageSite. ArchaeologistFanwassenttoDunhuangaftergraduatingfromPekingUnivereityin1963.WhileinDunhuangaremotevillageinthedesertthenFanlivedinanabandonedtemple.Atfirstshedidnotevendaretogoouttothetoiletatnight.ToprotectthetreasuresfromsandanddampnessFanandotherworkersputdoorsonthecavesplantedtreesandstartedmonitoringtemperatureandhumidity湿度inthecaves.Theyalsocontrolthenumberofvisitors. Inthelate1990swithtourismboomingnationwidesincenationalholidayswereextendedthelocalgovernmentplannedtogopublicwithDunhuangMogaoGrottoesbutfoundFanfirmlyintheirway.Theheritagewouldhavebeendestroyedifithadbeenlistedshesaid. Dunhuangacademyhasnowphotographedandcatalogedonlineallthesculpturesandpaintings.Despiteoureffortstominimizedamagewecan'tcompletelystopthemfrombeingeroded腐蚀.Butthedigitaldatabasewilllast. FanwasgratefulwhenherhusbandjoinedherinDunhuangin1986after19yearsofseparation.HertwosonsgrewupinShanghaiwiththeiraunt.Ihavenotbeenagoodmotherorwife.WithregardtomyfamilyI'mfullofguiltshesaid.Fan79retiredtwoyearsagoasthedirectorofDunhuangAcademybutcontinueshereffortsasanationalpoliticaladvisor. 28.Whichmeasuresdidn'tFanJinshitaketoprotectDunhuangMogaoGrottoes A.OpenedDunhuangMogaoGrottoestothepublicextensively. B.PlantedtreesandstoppedtheDunhuangMogaobeingeroded. C.Picturedandclassifiedallthesculpturesandpaintingsonline. D.Putdoorsonthecavesandmonitoredtemperatureandhumidity. 29.WhenwasFanseparatedfromherhusband A.In1963. B.In1967. C.In1986. D.Inthelate1990s. 30.Thepassageismainlyabout. A.thehistoryofDunhuangMogaoGrottoes B.theattractionsofDunhuangMogaoGrottoes C.Fan'sdevotiontopreservingDunhuangMogaoGrottoes D.theappealfortheprotectionofDunhuangMogaoGrottoes 31.WhatkindofpersondoyouthinkFanis A.considerateandeasy﹣going B.kindandintelligent C.humorousandsweet﹣tempered D.devotedandpersistent.
1分﹣WhynotusethecomputersJack ﹣Ourcomputersbyavirussotheengineerdisabledallofthem. A.attack B.hadattacked C.areattacked D.wereattacked
如图已知ACAD是⊙O的两条割线AC与⊙O交于BC两点AD过圆心O且与⊙O交于ED两点OB平分∠AOC. 1求证△ACD∽△ABO 2过点E的切线交AC于F若EF∥OCOC=3求EF的值.[提示+1﹣1=1]
九年级1班全班50名同学组成五个不同的兴趣爱好小组每人都参加且只能参加一个小组统计不完全人数如下表 已知前面两个小组的人数之比是15. 解答下列问题 1a+b=. 2补全条形统计图 3若从第一组和第五组中任选两名同学求这两名同学是同一组的概率.用树状图或列表把所有可能都列出来
8分SheWalkedThroughFire OnThanksgivingweekendtheHeffelmirefamilygatheredforamealattheirhome.AfterdinnerthefamilywentdowntothefinishedbasementtorelaxexceptCharlotte'sfatherEricwhowasinthegaragetofixhistruck. Around8pmCharlottedecidedtocheckonherdad.Shewalkedthroughthekitchen.Whensheopenedthesidedoortothegarageblacksmokeroseupintothekitchen.Shecouldbarelymakeoutherfatherlyingonhisbacktrappedunderthetruck.He'dremovedthefrontpassenger﹣sidetyreandraisedthetruckonajack千斤顶.Thetruckhadslippedoffthejackandnowthewholeweightofthewheelwasonhischestandshoulders. Charlotterantothefrontofthetruckandstruggledtoliftit.EricwasstillconsciousandheyelledYougotit!Onemoretry!Shetriedagainandwasabletotipthetruckbackwardjustenoughforhertopullherdadbytheshirtwithbothhandsfromunderthetruck. Shedraggedhimacrossthegarageand20feetdownthedriveway.Thensheranbacktothegaragewhichhadburstintoflames.IwasafraidthecarwasgoingtoexplodesaysCharlottesosheclimbedintothetruckwhichfacedforwardturnedthekeyandpressedthegaspedal油门.Thecarslowlyrolledoutthemetalwheelscratchingloudlyagainsttheconcrete. SafelyonthedrivewayCharlottestoppedthetruckandranbacktothebasement.There'safire!Everybodygetout!sheyelledasshepickedupherthree﹣month﹣oldnieceandranout.Outsideshehandedthebabytohermomandthenranaroundtotheburninggarage.Shepickedupagardenhose水管andsprayedthefirewhilecalling911. Afewminuteslaterfirefightersandanambulancearrived.Charlottewastreatedforsecond﹣degreeburnsonbothherfeetandface.Herdadhadinjuriesonhischestandshouldersaswellasminorburnsonhisface.Thegarageandthehouseweredamagedbutthefamilysurvived. TheHeffelmiresarestayinginanapartmentwhiletheirhouseisrebuilt.Charlotteisaremarkablekidsaysherdad.CharlottehoweversimplysaysIwassavingmyfamilyandmyhouse.Iwasn'tgoingtoletmydaddie. 59.Ericgottrappedbecause. A.thekitchenwasonfire B.thewheelfelloffthetruck C.thefronttyrewasremoved D.thetruckslippedoffthejack 60.Whichofthefollowingisthecorrectorderoftheevents a.Charlottecalledthefirefighters. b.CharlottesavedEricfromunderthetruck. c.Charlottedrovethetruckoutofthegarage. d.Charlottewarnedthefamilytoleavethehouse. A.bcad B.abdc C.acbd D.bcda 61.Asaresultofthefire. A.thetruckexploded B.thehousewasnotfittolivein C.thethree﹣month﹣oldbabywasinjured D.Charlottewasburnedonherchestandshoulders 62.ItcanbeinferredfromthepassagethatCharlotteis. A.proudandclear﹣headed B.modestandeasy﹣going C.calmandquick﹣minded D.independentandself﹣centered.
如图已如平行四边形OABC中点O为坐标顶点点A30C12函数y=k≠0的图象经过点C. 1求k的值及直线OB的函数表达式 2求四边形OABC的周长.
10分 HowtoCreateaMindMap Mostofusthinkvisuallybutwewritetextually.36Italsomakestheinformationwelistmoredifficulttoprocessrememberandshare. 37Itcombinesthebrain'svisualnaturewithourtendencytowritedownwords.Weendupwithadiagramthatcombineslogicandorderinalessstructuredmanner.Thispromotesclearerthinkingandbettercomprehension.38 SohowdoyoucreateamindmapThemostbasicmethodistojustuseapenandpaperoramarkerandwhiteboard.Itbeginswithacentraltopicorideathenflowsoutward.39Thenextleveloftopicsisrepresentedbybranchesextendingfromit. Therearen'treallyanyrulesforcreatingmindmaps.Whilemostflowoutwardlyfromthecentraltopicsomeusersprefertobuildmindmapsinonedirection.40Thiscanmakegroupsofideaseasiertoidentifyandremember.Italsomakesamindmapmoreenjoyabletocreateanduse. Mindmapsareextremelyeffectivefortakingnotesplanningaprojectbrainstorminganideapresentinginformationtoothersandmanyotheruses.Takeoutyourpenandhaveatry. A.Theyhelptoclarifythinking B.Thisgoesagainsthowourmindsactuallywork C.Theyhelpussavetimebyfocusingonkeyissues D.Amindmapistheperfectanswertothisdilemma E.Thinkofitasatreewherethecentralpointisthetrunk F.It'salsoalotmoreenjoyablethansimplywritingdownlists G.Otherliketoaddcolorspicturesorsymbolsintheirmindmaps.
下列四个命题 ①两直线平行内错角相等②对顶角相等③等腰三角形的两个底角相等④菱形的对角线互相垂直 其中逆命题是真命题的是
计算﹣13+﹣π﹣1120﹣2tan60°
1分Weworrysomuchabouthim.Heisoldenoughtotakecareofhimselfatcollege. A.couldn't B.mustn't C.needn't D.daren't
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