欢迎来到天天文库
浏览记录
ID:33158728
大小:995.00 KB
页数:38页
时间:2019-02-21
《emission spectra - juniata college发射光谱-朱尼亚塔学院》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、JuniataCollegeScienceinMotionEmissionSpectra“TheElements”JuniataCollegeScienceinMotionJuniataCollegeScienceinMotionVocabularyAtomElementSpectrum(anyofthefollowingtypesofspectrumlistedbelow)Electromagneticspectrum(EM)ElementMoleculeWavelengthJuniataCollegeScienceinMotionVocabularyAlldefi
2、nitionsarefromhttp://dictionary.reference.comAtom·Aunitofmatter,thesmallestunitofanelement,havingallthecharacteristicsofthatelementandconsistingofadense,central,positivelychargednucleussurroundedbyasystemofelectrons.Theentirestructurehasanapproximatediameterof10-8centimeterandcharacteri
3、sticallyremainsundividedinchemicalreactionsexceptforlimitedremoval,transfer,orexchangeofcertainelectrons.·Thisunitregardedasasourceofnuclearenergy.Element·Asubstancethatcannotbereducedtosimplersubstancesbynormalchemicalmeansandthatiscomposedofatomshavinganidenticalnumberofprotonsineachn
4、ucleus.·Anyofmorethan100fundamentalsubstancesthatconsistofatomsofonlyonekindandthatsinglyorincombinationconstituteallmatter·Eachelementemitsauniquespectrum.Theseelementscanbeidentifiedbytheirwavelengthsinnanometers.http://hyperphysics.phy-astr.gsu.edu/hbase/vision/specol.html#c1Emittogi
5、veofforsendout(theprocessiscalledemission)Energy:theabilitytodowork;lightisaformofenergyLight·Electromagneticradiationthathasawavelengthintherangefromabout4,000(violet)toabout7,700(red)angstromsandmaybeperceivedbythenormalunaidedhumaneye.·Commontermforelectromagneticradiationofanywavele
6、ngthJuniataCollegeScienceinMotionTheSpectrumofVisibleLightThevisiblepartofthespectrummaybefurthersubdividedaccordingtocolor,withredatthelongwavelengthendandvioletattheshortwavelengthend,asillustrated(schematically)inthefollowingfigure.Thevisiblespectrumhttp://csep10.phys.utk.edu/astr162
7、/lect/light/spectrum.htmlhttp://www.nsta.org/main/news/stories/science_teacher.php?news_story_ID=48612&print=yesJuniataCollegeScienceinMotionMolecule:Thesmallestparticleofasubstancethatretainsthechemicalandphysicalpropertiesofthesubstanceandiscomposedoftwoormoreatoms;agroupofli
此文档下载收益归作者所有