seeing color with cd’s

LIGO Education 2018 Explore more at www.ligo.caltech.edu 1 Seeing Color with CD’s Grade Level/s MS, HS Materials: CD’s, flashlights, LED’s of different colors Subject: Physical Science Objective: Understand the visible spectra using a CD and a CD spectroscope. Advanced Preparation of materials: Part 1: Part 2: Explore the colors reflecting off the CD. How many colors do you see? Describe the shapes of the colors. What other shapes do you see reflected on the CD? What if we change the angle at which you look at the CD? What if we change the light source? Explore using the different types of lights available. EX: LED’s, incandescent, florescent, sunlight Standards Disciplinary Core Ideas –PS4 Crosscutting concepts: Cause and Effect Patterns Structure and Function Science and Engineering Practices: Asking questions and defining problems Planning and carrying out investigations Developing and using models Purchase or collect CD’s for each student. Make 8 CD spectroscopes – link to instructions on last page.

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LIGO Education 2018 Explore more at www.ligo.caltech.edu

SeeingColorwithCD’s

GradeLevel/sMS,HS Materials:CD’s,flashlights,LED’sofdifferentcolors

Subject:PhysicalScience

Objective:UnderstandthevisiblespectrausingaCDandaCDspectroscope.

AdvancedPreparationofmaterials:

Part1:

Part2:

ExplorethecolorsreflectingofftheCD.Howmanycolorsdoyousee?Describetheshapesofthecolors.WhatothershapesdoyouseereflectedontheCD?

WhatifwechangetheangleatwhichyoulookattheCD?Whatifwechangethelightsource?Exploreusingthedifferenttypesoflightsavailable.EX:LED’s,incandescent,florescent,sunlight

StandardsDisciplinaryCoreIdeas–PS4Crosscuttingconcepts: CauseandEffect Patterns

StructureandFunctionScienceandEngineeringPractices: Askingquestionsanddefiningproblems Planningandcarryingoutinvestigations

Developingandusingmodels

PurchaseorcollectCD’sforeachstudent.Make8CDspectroscopes–linktoinstructionsonlastpage.

LIGO Education 2018 Explore more at www.ligo.caltech.edu

UnderlyingScience:WhydoesaCDsplitlightintoits’differentcolors?ACDismadeupoftwolayersofplasticprotectingathinlayerofaluminumonwhichthemusicordataisstored.Thisinformationisstoredinpitsorganizedincirculartracks.Linesofshinyaluminumwill“reflectwell”nexttolinesofpitswhich“reflectpoorly”.Thespacebetweentheselinesandpitsareveryclosetogether.Infact,theyaresoclosetogetherthattheyactasadiffractiongratingforlight.Thereflectionswillinterferewitheachotherconstructivelyanddestructively.

Whitelightisamixtureofcolors.Whenwelookatdifferentlightsourceswithoureyestheymightappeartobethesameshadeofwhite.UsingtheCDrevealsthattheyarecomposedoftotallydifferentcolorsorspectra.LightreflectedofftheCDisduetodiffraction,buttheamountoflightislarge.Thebestwaytolookatthecolorsorspectraoflightistoreducetheamountoflightlikeapinhole.Wewillinvestigatethespectraoflightusingaspectroscopewithaslit.SpectroscopeActivityHoldthetubeuprightandpointthetopslitatalightsource.Pressyoureyetotheviewinghole.Photoonpage3–viewingwithaspectroscope.OntheCD,lookforaclear,solidlineoflightbrokenupintocolorbands:thisisthespectrumoflightreflectedfromthelightontotheCD.AdjusttheangleatwhichyoulookthroughtheviewingholeattheCDtofindthebestviewofthelightspectrum.Differenttypesoflightsources:Fluorescentlight–producesbrightlinesproducedbythespectrumofthemercurygasinsidethetube.Incandescentlight–bycomparison,makesacontinuousspectrumofthespectrum(rainbow)ofcolors.UnderlyingScienceAlllightismadeupofwavesofelectromagneticradiation.Aspectroscopespreadseachdifferentwavelengthtoadifferentpositionwithinaspectrumoflight.Whenthelightentersthetube,itisspreadintoaspectrumperpendiculartotheCDtracks.Thisiswhytheslitandtheviewingholearelocatedatrightangles.Eachcolorbendsataparticularangle.Foryoutoseethespectrum,thelightmustdiffractofftheCDandreflectintoyoureye.AdjustingthetiltoftheCDallowsyoutoproperlybouncethespectrumintoyoureye.

LIGO Education 2018 Explore more at www.ligo.caltech.edu

Resources:

SafetyConsiderations:NeverusediffractiongratingstolookdirectlyattheSUN!

aapt.org/k12/TPTlessons.cfmOSA–OpticalSocietyCDSpectroscopewww.exploratorium.edu/snacks/cd-spectroscopeGetNakedPhysics–KitchenScienceExperiments–CDScienceFormoreinformationorquestionscontact:

KathyHolt–LIGOScienceEducationCenter

[email protected]

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