10月精听营真题文本.docx
- 文档编号:139691
- 上传时间:2022-10-04
- 格式:DOCX
- 页数:29
- 大小:129.07KB
10月精听营真题文本.docx
《10月精听营真题文本.docx》由会员分享,可在线阅读,更多相关《10月精听营真题文本.docx(29页珍藏版)》请在冰豆网上搜索。
1
1.Whatisthelecturemainlyabout?
d
(A)MisconceptionsaboutmuondetectorsinArchaeology
(B)Anexcavationofanancientstructureusingamuondetector
(C)Thecollaborationbetweenphysicistsandarchaeologistsinthedevelopmentofthemuondetector
(D)Benefitsthatarchaeologistscanobtainfrommuondetectors
2.Whatfeatureofthemuonsbenefitarchaeologists?
C
(A)Theirabilitytocarryinformationfromouterspace
(B)Theirabilitytobreakdowncosmicraysintosmallerparticles
(C)Theirabilitytopassthroughsolidmaterial
(D)Theirabilitytotravelatthespeedoflight
3.Accordingtotheprofessor,whatinformationcanamuondetectorprovideabouttheMayanpyramid?
B
(A)Thetemperatureinsideofthestructure
(B)Thelocationofroomswithinthestructure
(C)Theagerangeofthestructure
(D)Thetypesofmaterialusedtobuildthestructure
4.Whydoestheprofessordiscussdamagestoarchaeologicalsites?
A
(A)Todescribeabenefitofusingmuondetectorsinarchaeologicalstudy
(B)Toexplainanaccidentwithamuondetectorduringapyramidexploration
(C)Toindicatehowusefuldetectorsareinrestoringdamagedsites
(D)Toexplainwhymuondetectorswererarelyusedinthepast
5.Inwhatwaysaremodernmuondetectorsdifferentfrommuondetectorsusedin1967?
Clickon3answers.Cde
(A)Theyaremoreeconomical.
(B)Theyuselessenergy.
(C)Theyarenotaslarge.
(D)Theytakelesstimetoproduceanimage.
(E)Theycanscaninmorethanonedirection.
6.Whatistheprofessor’sopinionaboutthenewermuondetectors?
C
(A)Sheappreciatesthehelptheyprovideeventhoughittakesmuchtimetoproduceimages.
(B)Sheisafraidthatmanyarchaeologistswillbeunwillingtolearntousethem.
(C)Shethinksthattheyhavegreaterpotentialinareasofscienceotherthanarchaeology.
(D)Theyprovidemoreaccurateinformationabouttheageofobjectsthanolderdetectorsdid.
1
ListentopartofalectureinanArchaeologyclass.
P:
TalkingaboutonepopularmythinArchaeology,somepeoplesimplythinkexcavationisdiggingthesiteuntilsomethingvaluableisfound.Well,whilethereisanelementofluckinvolved,wehaveanarrayofhightechdevicestohelpusfigureoutwheretoputourefforts.Youknow,wecan’tjustdigupthesiterandomlylookingforanancientstructure.Thereisoneofthenewertoolsactuallycreatedbyadifferentfieldofstudy.Themachinereliesonparticlephysics.Um...interdisciplinaryI’dsay.Anditiscalledamuondetector,orcounter.
Muonisachargedelementaryparticlesimilartoelectron.Okay,letmestartover.OnEarth,mostnaturallyoccurringmuonsarecreatedbycosmicrays,whichconsistmostlyofprotons,manyarrivingfromdeepspaceatveryhighenergy.Whenthesechargedparticlesofcosmicrayscollidewithmoleculesintheupperatmosphere,theybreakupintosmallerparticles,muons.Travelingatthespeedoflight,muonscanpenetratetensofmetersintorocksandothermatteronEarth'ssurface.Infact,theycanpassthroughsolidmatter,sotheycantransmitdeepintothesurface.Thus,thispropertyofmuonisperfectforarchaeologiststotakeadvantageof.
Letmeexplain.Overthecourseofseveralmonths,onedetectorcanbuildupapictureshowingtheshadowsofstructuresthey’restudying-liketheMayanpyramidinCentralAmerica,forexample.We'reinterestedinfindingoutifthereareburiedchambersorotherroomsinside.Well,amuondetectorcantrackagreatnumberofmuonpassingthroughthelessdensespaceinsidethepyramid.Yes,youhaveyourhandup?
S:
Idon'tthinkIgethowthisdeviceworksexactly.
P:
Okay,well,whenmuonspassthrough...uh...say...stonewallsofapyramid,densematerial,theyloseenergy.So,inthecaseofemptyspace,moremuonscanpassthroughbecausetheyloselessenergy.Themuondetectorcanidentifytheareabymeasuringtheamountofmuonsineachplace.Wecanseedarkercolorsinemptyspaces,sowewindupwithasortof.pictureofthesiteanditsinternalstructure.
S:
Picture?
P:
Yes,inthesamewaythatCTscansproducea3-Dpictureofyourbodyusingx-rays.Itliterallyisliketomographyinthemedicalsense.
S:
Okay,soifdarkerareasshowupinsidethepyramid,weassumeit’sanemptyspacewithmoremuons.
P:
Yougotit.Thistechnologyenablesustoseewhat'sinsideofthestructurebeforewedigupthesite.So,nowwe
knowexactlywheretoexcavate,andwecanminimizethedamage.Youknow,evenalittledamagecouldresultinlosingcrucialinformationforever.
Now,itwaswhenarchaeologistsbegantousemuondetectorsthattheyimproved.Fourdecadesago,In1967,aphysicistburiedthesedetectorsintheground,surroundingtheEgyptianpyramids.Hewaslookingforburiedchambers.However,hesawnosurprisesinthatexperiment.Buthed
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- 10 月精听营真题 文本
![提示](https://static.bdocx.com/images/bang_tan.gif)