emission spectra - juniata college发射光谱-朱尼亚塔学院

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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