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时间:2019-11-15
《2019-2020年高一英语 Unit16《Scientists at work》备课资料 旧人教版第一册》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、2019-2020年高一英语Unit16《Scientistsatwork》备课资料旧人教版第一册一、异域风情1.AlexanderBell'sGreatInventionMostpeopleknowthatAlexanderGrahamBellinventedthetelephone.Butnotmanyknowaboutaccothertalkingdeviceheinventedjustfouryearslater,in1880.Hecalledthedevicethephotophone.‘Photophone’esfromtheGreekwordsfor‘light
2、’and‘sound’.Thephotophonedidnotuseelectricitytocarrysoundoverwiresbetweentwopeople.That'swhatatelephonedoes.Instead,thephotophoneusedabeamofsunlighttravellingthroughtheair.Withhisinvention,Bellcouldactuallytransmithumanspeechonabeamoflight.Todoso,hespokeclosetoathinmirrorthatwasreflectingsu
3、nlight.Thevibrationsofhisvoicecausedthemirrortovibrate,andthevibratingmirrorcausedthelighttovibrate.Thevibratinglighthitalight-sensitivecellinareceiverplacedsomedistanceaway.Thecellchangedthelightpatternsintoelectricalsignals.Earphoneschangedthesignalsbackintosounds.Bellbelievedthathisideao
4、ftalkingonabeamoflightwouldprovetobeimportant.Heoftencalledthephotophonehisgreatestinvention.Eventhoughthephotophonedependedonasourceofenergythatwasnotconstant—thesun—Bellwasn'tabitdiscouraged.Hefeltsurethatpeoplewouldonedaytalkusingbeamsoflight.TwomuchmorerecentdevelopmentsmadeBell'sdreame
5、true.In1960,ascientistbuiltthelaser.Alaserproducesahighlyconcentratedbeamoflight.Shortlyafterward,otherscientistsdevelopedanewkindofopticalfibre.Theopticalfibreisaglassthread.Thenewfibrecouldcarrylightbeamslongdistances—asfarasseveralmiles.2.WhoInventedMotionPictures?Thepleasureswhichamovie
6、filmoffterstooureyeshavebeenpaidforwiththelossofsightofamanwhosenameishardlyknownoutsidetheannalsofscience—JosephPlateau,aBelgianprofessorborninBrusselsin1801.Hestudiedthemechanismofsight,beginningaseriesofmostdangerousexperimentsattheageof28bystaringintothesunfor25secondstoseewhattheeffect
7、onhiseyeswouldbe.Hewasblindfornearlyamonth.Buthewentonexperimenting,increasingthelengthoftimeduringwhichhelookedintothesun,knowingthatintheendthiswouldcosthimhissight.Attheageof42hewaspletelyandincurablyblind;thesunhaddestroyedtheretinaofhiseyes.Buthecon
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