Color Addition Lab

[Pages:3]TheLaboratory

ColorAdditionLab

Teacher'sGuide

Topic: LightandColor

Thefollowinginformationisprovidedtothestudent:

Question: Whatistheresultofaddingcombinationsofthethreeprimarycolorsoflightinequalandunequal intensities? Purpose: Todeterminetheresultofaddingprimarycolorsoflightinequalandunequalintensitiesandto developfourgeneralrulesofcoloradditionforaddinglightcolorsinequalintensity. Acompletelabwrite-upincludesaTitle,aPurpose,aDatasection,andaConclusion/Discussionof Results.TheDatasectionshouldincludetheprovidedtablewithallrowscompleted.The Conclusion/DiscussionshouldrespondtothequestionraisedinthePurposeofthelab.

URL:

MaterialsRequired: Onlineinteractivecolormixingboxat.

DescriptionofProcedure: Studentsgotothewebpagelistedaboveandscrolldownuntiltheyseetheinteractivecolormixing animation.Thethreesquarescanbecompletelyorpartiallyoverlapped.Thesliderscanbeadjustedto altertheintensityofthethreeprimarylightcolors.Therelativeintensityofeachcolorislistedasa numberbetween0and255.Studentsadjusttheintensitiestocreatethecolorsindicatedinthe provideddatatable.

AlternativeMaterialsandProcedure: NumerousJavaappletsandonlineanimationsareavailableforsettingtheR-G-Bcharacteristicsofa colorandobservingtheresult.

SafetyConcern: Thereisalwaysahigherthanusuallevelofriskassociatedwithworkinginasciencelab.Teachers shouldbeawareofthisandtakethenecessaryprecautionstoinsurethattheworkingenvironmentisas safeaspossible.Studenthorseplayandoff-taskbehaviorsshouldnotbetolerated.

Suggestions,Precautions,Notes: 1. Verylittleintroductiontotheprinciplesofcoloradditionarerequiredforthisactivity.Theactivity itselfwilldotheteaching.Itwouldbehelpfulforstudentstoknowthatcomputersandtelevisions createcolorbyadjustingtheintensitiesofthreelightcolors-red,greenandblue.

?ThePhysicsClassroom,2009

TheLaboratory

2. Thefactthattheintensityofeachcolorcanrangefrom0to255illustratesacolordepthof8-bits; thatis,thereare28possibleintensitiestowhicheachofthethreecolorsoflightcanbeadjustedto.

3. Studentswillofteninsistthatred,rmthemthatthe red,blueandyellowofartclasswasreferringtotheprimarycolorsofpaint.Physicsisreferring red,greenandblueastheprimarycolorsoflight.

4. Followthisactivityupwithadiscussionofprimaryandsecondarycolorsoflightandthesimple rulesofcoloraddition.

AuxiliaryMaterials:

ThefollowingpageisprovidedtothestudentforcompletionandinclusionintheDatasectionoftheir

labnotebook.

Goto:

Whatrelativecolorintensitiesareneededinordertoproducethecolortypicalofthefollowingobjects?

a.yellowschoolbus

Red_________Green_________Blue_________

b.cyansky

Red_________Green_________Blue_________

c.magentaink

Red_________Green_________Blue_________

d.orange.....orange

Red_________Green_________Blue_________

e.milkchocolatebrown

Red_________Green_________Blue_________

f.lavenderflower

Red_________Green_________Blue_________

g.lightpinkrose

Red_________Green_________Blue_________

h.purplegrape

Red_________Green_________Blue_________

i.navyblueBear'sjersey Red_________Green_________Blue_________

j.forestgreencar

Red_________Green_________Blue_________

Comeupwithfourofyourown:

k._________________

Red_________Green_________Blue_________

l._________________

Red_________Green_________Blue_________

m._________________

Red_________Green_________Blue_________

n._________________

Red_________Green_________Blue_________

ScoringRubric:

L6. ColorAdditionLab Included,labeledandorganizedallpartsofthelabreport. Datasectionincludestheprovidedtable. Conclusion/Discussionclearlyandaccuratelystatesfourrulesofadding

twoormoreoftheprimarycolorsoflightinequalintensityanddiscusses theresultofaddingprimarycolorsoflightinunequalintensity.

Score

_____/_____

?ThePhysicsClassroom,2009

TheLaboratory ConnectionstoThePhysicsClassroomTutorial:

Thefollowingreadingsareasuitableaccompanimenttothislab:

ConnectionstoMindsonPhysicsInternetModules:

Sublevel3oftheLightandColormoduleisasuitableaccompanimenttothislab:

?ThePhysicsClassroom,2009

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