资源描述：
《GRE阅读笔记NO7-1》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、NO7-1---byskyshylinNO.7-1Section1 OurvisualperceptiondependsonSE thereceptionofenergyreflectingor radiatingfromthatwhichwewishto perceive.Ifoureyescouldreceiveand(5)measureinfinitelydelicatesense-data, wecouldperceivetheworldwith infiniteprecision.Thenaturallimits ofoure
2、yeshave,ofcourse,been extendedbymechanicalinstruments;(10)telescopesandmicroscopes,forexample, expandourcapabilitiesgreatly.ThereTS is,however,anultimatelimitbeyond指示词 whichnoinstrumentcantakeus;this limitisimposedbyourinabilityto(15)receivesense-datasmallerthanthose﹤ conv
3、eyedbyanindividualquantumof energy.Sincethesequantaarebelieved指示词 tobeindivisiblepackagesofenergy andsocannotbefurtherrefined,we(20)reachapointbeyondwhichfurther resolutionoftheworldisnotpossible. Itislikeadrawingachildmightmake bystickingindivisiblediscsofcolor ontoacanv
4、as.(25) Wemightthinkthatwecouldavoid thislimitationbyusingquantawith extremelylongwavelengths;suchquanta wouldbesufficientlysensitiveto conveyextremelydelicatesense-data.(30)Andthesequantawouldbeuseful, aslongasweonlywantedtomeasure⊙ energy,butacompletelyaccurateSE指示词— pe
5、rceptionoftheworldwilldependalso ontheexactmeasurementofthelengths(35)andpositionsofwhatwewishto perceive.Forthis,quantaofextremely longwavelengthsareuseless.To measurealengthaccuratelytowithina millionthofaninch,wemusthavea(40)measuregraduatedinmillionthsofanNO7-1---byskys
6、hylin inch;ayardstickgraduatedininchesis useless.Quantawithawavelengthofone inchwouldbe,inasense,measures thataregraduatedininches.Quantaof(45)extremelylongwavelengthareuselessin measuringanythingexceptextremely⊙ largedimensions. Despitethesedifficulties,quantaSE指示词— ha
7、veimportanttheoreticalimplications(50)forphysics.Itusedtobesupposed that,intheobservationofnature, theuniversecouldbedividedinto twodistinctparts,aperceiving subjectandaperceivedobject.In(55)physics,subjectandobjectwere supposedtobeentirelydistinct, sothatadescriptionofany
8、part oftheuniversewouldbeindependent oftheobs
