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Download Day #3 - Russell County Schools
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Russell County Schools Non-Traditional Instructional Expectations NTI Day #3 School RCHS Course/Subject Science I Teacher Ackerman, Branscum, Holmes Learning Target:Studentswillreadpassageandanalyzespectraldatatodeterminethespeedanddirectionofa nearbygalaxy.StudentswillrespondtodiscussionquestionsaboutHubble’sLaw Lesson Directions: Studentswillreadthepassageinthe“HowFarandHowFast”handout. Thenstudentswillanalyzethespectralanalysisofamotionlessobjectandcomparethistothe followingspectrums.TheywillapplyHubble’sLawtodetermineiftheobjectismovingcloseror fartheraway. Thenthestudentwillanalyzethespeedtheobjectistravelingandrankthemfromslowestto fastestbasedontheinformationinthespectrum. Technology-based Alternate Assignment Options: _______________________________________________ Watch the following YouTube video and write a half-page to whole page summary about the video: https://www.youtube.com/watch?v=KhhaED90PoE_________________________________________________ _______________________________________________ Supplemental Resources and Support: __________________________________________________________ ________________________________________________________________________________________________ To Contact School/Teacher for Support: School Phone (9:00 AM-3:00 PM): 270-866-3341 Teacher Email (12:00-6:00 PM): [email protected] [email protected] [email protected] *Students will be contacted by a teacher on each NTI Day using the phone number provided on the Student Data Sheet. Please ensure that any changes in phone numbers are reported to the school throughout the year. Reminder: Remember that these assignments are due back to the teacher within 2 school days. Stars,Galaxies,andtheHowFarandHowFast? Youknowthatelectromagneticradiationisenergyintheformofwaves.Planets,stars,andgalaxiesemit electromagneticradiation.Asoneoftheseobjectsmovesthroughspacetowardanobserver,thewavesof electromagneticradiationbetweentheobjectandtheobservermoveclosertogether.Thatis,thedistancebetweenthe crestsofthewavesdecreases,causingthewavelengthtoshorten.Ifthatsameobjectmovedawayfromanobserver, thewavesbetweentheobjectandtheobserverwouldmovefartherapartfromeachother.Thedistancebetweenthe crestsofthewaveswouldincrease,andthewavelengthwouldlengthen.WhenastarismovingtowardEarthveryfast, thewavelengthofitslightshortens,causingittoappearslightlymorebluethanusual.Ifastarismovingawayfrom Earthveryfast,thewavelengthofitslightlengthens,causingittoappearslightlymorered.Bymeasuringthisblueshift orredshiftoflight,astronomerscandeterminewhetherthestarismovingtowardorawayfromEarth,andhowfast.To dothis,astronomersusetheshiftofspectrallinesproducedbychemicalsinthestar’satmosphere.Astronomerscan alsousethespectrumofagalaxytotellhowfastthegalaxyismovingtowardorawayfromEarth.Usingtheprincipleof redshift,EdwinHubblestudiedtherelationshipbetweenagalaxy’sdistanceandthespeedatwhichitmovesawayfrom Earth.Hefoundthatthefartherawayagalaxyis,thefasteritmovesawayfromEarth.Thisrelationshipiscalled Hubble’sLaw.Basedonthespectrumsinthefigure,rankthefourgalaxiesinorderofthespeedwithwhichtheyare movingawayfromEarth,fromslowest(1)tofastest(4). GalaxyA GalaxyB GalaxyC GalaxyD Rank(1=slowestand4=fastest) RespondtoQuestions 1.BasedonHubble’sLaw,whichofthegalaxiesisfarthestfromEarth? 2.AreanyofthegalaxiesmovingtowardEarth?Explain.
