teacher’s guide for: laser sound waves · rock-it science teacher’s guide laser sound waves --...

Contents: Quick Reference Sheets:

• Intro: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page2• Experiment:Laser Sound Waves . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page3• EquipmentList . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page4• Story,Part1:Evil Mister Fred's Snakeskin Windows . . . . . . . . . . . . .page5• Story,Ending . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page6

Video Transcript:• Intro: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page7• Story,Part1:Evil Mister Fred's Snakeskin Windows . . . . . . . . . . .page10• Experiment:Laser Sound Waves . . . . . . . . . . . . . . . . . . . . . . . . . . . .page12• StoryEnding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page16

Teacher’s Guide for:

Laser Sound WavesNote: All activities in this document should be performed with adult supervision. Likewise, common sense and care are essential to the conduct of any and all activities, whether described in this document or otherwise. Parents or guardians should supervise children. Rock-it Science assumes no responsibility for any injuries or damages arising from any activities.

Note: All activities in this document should be performed with adult supervision. Likewise, common sense and care are essential to the conduct of any and all activities, whether described in this document or otherwise. Parents or guardians should supervise children. Rock-it Science assumes no responsibility for any injuries or damages arising from any activities.

LaserSoundWavesARock-itScienceLessonFilmedJuly,2009

Title Page of Video

NOTE: This is the transcript of a lesson that was videotaped during an actual Rock-it Science class with real students, not actors. The students’ brainstorming comments are included on the video but are not transcribed here because they’re not part of the lesson presentation.

Rock-it Science2110 Walsh Ave, Unit FSanta Clara, CA 95050www.rockitscience.org

(c) 2013 Rock-it Science Educationally Useful Programs. All Rights Reserved

Rock-it Science Teacher’s Guide Laser Sound Waves -- Page 2

Intro Quick Recap:• Therearetwomarchingbands .Oneofthemwearsalldifferentcolorsandmovesaroundinalldifferentdirections .Theotherbandmarchesinperfectunison,allinthesamedirection .

• Theserepresenttwothingsthatdealwithlight .Askstudentswhattheymightbe .

• Thefirstbandrepresentsvisiblelight .Thesecondrepresentslaserlight .

• Demonstratealow-intensitylaserpen,showinghowthelightdoesn’tspreadout .

• Explainhowtousethelaserpenssafely--don’tshinetheminyourownoranyoneelse’seyes .

• Ifyouyellloudly,yourvoicemakesvibrations .• Todemonstrate,usealongflexiblespring .Studentholdsoneendstill,whiletheteacherholdstheotherendandrotatesthespringlikeajumpropetocreateawaveform .Differentspeedsofrota-tioncreatedifferentnumbersofpeaksandvalleysinthewave,correspondingtodifferentcolorsoflightordifferentsounds .

• Todayyou’regoingtotrytoseeyourvoice .

The Stanford Band goes in all different directions.

The Podunk Band marches in perfect unison.

Student stands on table holding spring while instructor rotates it at various speeds.

Rock-it Science Teacher’s Guide Laser Sound Waves -- Page 3

Experiment Quick Recap:• Teacherdemonstrateshowtobuildthedevicebeforestudentsbuildtheirs .

• Showstudentsaclearplasticcupwithaone-inchholeinthebottom .Demonstratehowtostretchacut-offballoonoverthemouthofthecuptomakeadrum .

• Glueacraftsticktothesideofthecup .Attachaplasticswivelclamptotheendofthecraftstick,usinggluetokeepitinplace .

• Attachahalf-inchself-stickmirrorontothecenteroftheballoon .• Takealaserpenwithwiresandalligatorclipsattachedtoit,andinsertitintotheswivelclamp .Wrapelectricaltapearoundthepensothatthetapepressesonthe“on”button,keepingitturnedon .Attachtheotherendsofthewirestoa6-voltbattery .

• Adjustthepensothebeambouncesoffthemirrorinthecenteroftheballoon .Useadditionaltapeifneededtokeepitinplace .

• Holdthecupsothelaserbeambouncesoffthemirrorandhitsawall .Holdthebottomofthecupnearyourmouthandmakesoundssothatthelaserimageonthewallformspatterns .Turnoffthelightstomakeitmorevisible .

• Passoutsuppliestostudentsandhavethembuildtheircupde-vice .

• Turndownthelightsandletstudentswanderaroundtheroom,pointingtheirlaserbeamsatthewallswhiletheytalkandyellintothecups .

• Optional:Turnonafogmachinetomakethebeamsmorevisible .• Atendoflesson,havestudentstakethetapeoffthedevicesandreturnthelaserpens,batteries,andalligatorclipstotheteacher .Studentskeeptherestoftheapparatus .

Square mirror in center of balloon.

Laser pen inserted in clamp.

When you shout into the hole in the cup, the laser makes an image on the wall.

Rock-it Science Teacher’s Guide Laser Sound Waves -- Page 4

Equipment List: “Laser Sound Waves”Items needed for Instructor:

• Longflexiblespring• FogMachine• Powerstripsforglueguns• Vinyltablecover

Items needed for Students:

Consumables (per student):

• 16ozPlasticCupwith1”roundholeinbottom• 11”Balloon,withneckcutoff• 1”SquareSelfAdhesiveMirror• CraftStick• PlasticSwivelClamp• 1”wideElectricalTape(about4”long)• GlueStickOther (per student):

• SmallLaserPen• 6-voltBattery• TwoInsulatedCableswithAlligatorClips• HotGlueGun

Prep Work:

• Burnholeinbottomofplasticcups• Cuttheneckoffballoons• Attachalligatorcablestolaserpens• NOTE:Theswivelclipusedinthevideowasdonatedtous,andisnotreadilyavailable .Sowe’veaddedanalternateconstruction,whichisexplainedinthefinalvideosegment,“AlternateConstruction .”

• AlsoseethePrepvideoforthisles-sonforinstructionsontrimmingtheballoonsandburningtheholeinthebottomoftheplasticcups .

Laser Pen and Mirror apparatus.

The Slinky Spring Alternate construction, using three Lego bricks instead of the swivel clip.

Apply the mirror AFTER the pen is in place. Electrical tape can also be used to hold the balloon on the cup more securely.

Story Recap: “Evil Mister Fred's Snakeskin Windows”

Rock-it Science Teacher’s Guide Laser Sound Waves -- Page 5

Part 1:

• EvilMisterFredwantstotakeovertheworld .He’scalledameetinginhiscastlewithotherevilpeopleandcreaturestomakeplans .

• Theothersdidn’tlikethedarknessinsidethecastleandwantedsomewindows .• EvilMisterFredtoldhisminionstomakesomewindows .Theyworedowntheirbaseballbatstryingtomakewindows,buttheycouldn’tbreakthroughtherock .

• EvilMisterFredcalledtheAcmeStoreofEverythingandorderedathousandbaseballbats .Buttheshipmenthadn’tarrivedyet,sodeliverywasgoingtobedelayed .

• EvilMisterFredgavehisminionshammers,toldthemnottohiteachother,andtheywereabletomakesomeholesinthecastle .

• Thenitwastoocold,soEvilMisterFredtoldtheminionstofindsomethingtocoverthewin-dows .

• Theminionsfoundalargesnakeskin,andEvilMisterFredcutpiecesoutofitandplacesthemoverthewindowopenings .Thatallowedsomelighttocomeinandkeptitwarm .

• AsEvilMisterFredstartedmakinghisevilplanswiththeotherpeople,abirdwasflyingaround .EvilMisterFredtriedtohitit,andthebirdgotmad .Soithidinacornerandlistenedtoevery-thingtheysaid .

• JackandJillwerelivingonaraftintheocean .Thebirdcameandwarnedthem .Theplanhadsomethingtodowithashipfullofbaseballbatsthatwasonitsway .

Story Recap (cont.)

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Ending:

• JackandJillaretryingtofindoutEvilMisterFred’splan .Jillorderedawholebunchofdarknessthatcoveredeverything,andJackorderedalaser .

• Jackstartedshiningthelaserallaroundinthedarkness .Whenheshoneisatthecastle,itbouncedoffthesnakeskinwindows .

• EvilMisterFredandtheothersweretalkinginside .Whenthelaserbeamreflectedoffthewin-dows,itmadewigglesontheground .Bylookingatthewiggles,Jillcouldseewhattheyweresaying .

• Sherealizedhewaswaitingforashipfullofbaseballbatsoutinthebaytoarrivesohecouldhavehisminionshiteverybodyoverthehead .

• JackandJillknewtheshipwasinthebay,buttheycouldn’tseeitinthedark .Theyshonethelaserbeamontheshipandwiggleditbackandforth .

• TheshipcaptainthoughtthelaserbeamwasasignalfromEvilMisterFredtothrowthebase-ballbatsoverboard .Theminionsweresupposedtorowoutandgrabthemastheyfloatedinthewater .Sothecaptainthrewallthebatsintotheoceanandsailedoff .

• JackandJillwentoutontheirraft,gatheredupallthebaseballbats,andtookthemhome .• EvilMisterFredcouldn’ttakeovertheworld,andtheotherguysgotreallymadandstartedbeat-inghimup .

Rock-it Science Teacher’s Guide Laser Sound Waves -- Page 7

Transcript: Introduction Okay,supposeyouhavetwomarchingbands .OneofthemisfromStan-ford,andthey’rewearingalldifferentcolors,andthey’retryingtomarchacrossthefield,butthey’regoingeverydifferentdirection .Sooneguygoesthatway,andaguygoesthatway,andthisone’sgoingaroundincircles,anotheronegoesupthere .SothisistheStanfordBand .Andlet’smakethembealldifferentcolors .Sothey’rezoomingaround,variouscolors .HaveyoueverseentheStanfordBand?Yeah,they’refunny .Theyjustgocrazy .

Andthenlet’ssupposethere’ssomeotherband,andthey’realldressedinred .Andtheymarchinstraightlines,andtheymarchallthewayinstep,allatthesamedistancefromeachother .ThisisPodunkUniversity .

Thoserepresenttwothingsthatdealwithlight .Whatdoyouthinkoneofthemmightbe?[Students offer suggestions.]

Whatcoloristhis?[Indicates Podunk]Whatcolorsdoyouseethere?[Indicates Stanford]

Thisonerepresentsalaserbeam[indicates Podunk] .Alaserbeamhasallthesamecolor,theyallmarchperfectlytogetherinlines,andthey’reallinstepwitheachother .Regularoldwhitelightisamixtureofawholebunchofdifferentcolors,anditshootsoffallovertheplace .

Todaywe’regoingtobeusinglaserbeams .You’veallseenlaserpensbefore,andit’skindofneatthatthedotsstaysmall .Whenyoushinearegularflashlight,thedotgetsbiggerandbigger .Soifallthemarchersaremarchingperfectlyinstepwitheachother,theydon’tbangintoeachother,andtheycanstayinanicetightformation .Ifthey’realldifferentfrequencies,theenergiesinteractwitheachotherandtheyspreadoutallovertheplace .

Therearesomehazards:Youdon’twanttostaredirectlyintothelaserbeamorshineitintoyoureye .WhenIwasbuyingsomeoftheseatthestore,theguysaid,“Oh,theseareharmless .Theywon’tdoanythingtoyou .Yeah,see?”Andheshineditinhiseye .AndIsaid,“Whoa,didn’tthathurt?”Hesaid,“Well,Idoseethisgreendot .EverywhereIlookthere’sagreendot .”Soyoudon’twanttostareintoitandgetgreendots .

So,youcanshineitatyourskin,anditdoesn’tdoanythingtoyou .Youcanshineitatyourbodyandstuff,butyoudon’twanttoshineitdirectlyintoyoureyes .Ifitgoesflashy-flashyacrossyourface,thatdoesn’tdoanythingtoyou .Youjusthavetolookintoitforafewsecondstodoanyharm .

Also,theotherthingyouneedtoknowis,ifyouyellloud,yourvoicemakesvibrations .Rememberwhenwehadthatspringout?DidIshowyouthespringthatmovesallovertheplace?No?Noslinkyspring?Let’sseeifwecanfindtheslinkyspring .

The Stanford Band goes in all different directions.

The Podunk Band marches in perfect unison.

Rock-it Science Teacher’s Guide Laser Sound Waves -- Page 8

[Gets slinky spring]Lightdrivesscientistscrazy .Someofthetimeitflowsaroundlikeit’swaves,someofthetimeitflowsaroundlikeit’smachinegunbullets .

Ineedavolunteerfromtheaudience .[Selects a student]Ah,there’savolunteer .Standonthetable,vol-unteer .[Student stands on table; instructor hands one end of the spring to student]Hangontothiswithbothhands,andhangontight,soifIpullonitIcan’tgetitoutofyourhands .Okay?Youstaythere .[Instructor moves to other end of table] Youcanfaceme .Turnaroundsoyoufaceme .Andyou’rejustgoingtoholdyourendtight .[To other students]You’vegottowatchout--ifheletsgoyoudon’twanttogetsmackedintheface .

I’mgoingtowiggleitandthenwe’llseewhatitdoes .Ifwe’redoingjumprope,I’lljustmovemyend .Youkeepyourendsteady .[Rotates spring like a jumprope]Thiswillbeajumprope,andonepersoncouldjumponit,anditrepresentsredlight .Redlightisabiglazywave .What’sthenextcolordownontherainbow?[Stops rotating]

Orange .Orangehasmoreenergythanreddoes .[Rotates spring faster]Soorangemightlooklikethat,makingtwojumpropersinthesamespace .Theyhavetojumpfaster,though,becausethere’smoreen-ergy .What’sthenextcolordownfromorange?[Stops rotating]

Student stands on table holding spring while instructor rotates it at various speeds.

Rock-it Science Teacher’s Guide Laser Sound Waves -- Page 9

Yellow .Okay .[Rotates faster]Nowwehavethreejumpers,butboy,they’dbetterbequick,otherwisetherope’sgoingtosmackthem .Ifthelightisreallybright,there’dbeabigwave .Ifthelightisdim,it’sasmallwave .Okay,what’sthenextonedownfromyellow?[Stops rotating]

Green .[Rotates faster]What’sthenextonedownfromgreen?[Stops rotating]

Blue .Here’sblue .[Rotates faster]That’saboutasmanyasmyarmcando .Andthemorestepsyougodown,themorewavesyougetinthesamespace .

Whitelightisamixtureofallthecolors .Soit’sabigwavemixedwithlittlewaves[Rotates spring in various ways],allrunningaroundreallyfast .Thelaserwavesarelikethis,asingleline[Straightens out spring, then rotates it quickly].Thelaserwavesareallexactlyonefrequency,allworkingperfectly .[Stops rotating]Okay,nowyoucanletgo .

Soundwavesarealotlikelightwaves .Thelowfrequenciesaregreatbigwaves;thehighfrequenciesarelittlewaves .Now,we’regoingtotryandseeyourvoicetoday .

Howcanyouseeyourvoice?Ahhhhhh .Canyouseemyvoice?[Whistles]Canyouseemywhistle?No .We’regoingtomakeitsoyoucanseeit .Butfirst,let’ssee,weneedsomekindofaweirdstory .

Let’ssupposethatEvilMisterFredisgoingtotakeovertheentireearth .Andhe’smakingplanstotakeovertheearth .Sohe’scalledtogethereverybodywho’sgoingtohelphiminhiscastle .Andthepeopleandthecreaturesthatcametohiscastledidn’tlikeitintherebecauseit’ssodark .Andtheysaid,“You’vegottomakesomewindows .”SoEvilMisterFredtoldhisminionstoputsomewindowsinthecastle .

Andtheminionsonlyhaveonetoolthattheycanuse,andthat’stheirbaseballbats .Sotheminionswentoutthereandstartedbangingonthecastle .Somewereinsidestandingontheladdersandstairsthatwentup .Andtheykeptbanging,banging,banging .Butthecastle’smadeoutofrock,andalltheydidwasweardowntheirbaseballbats .Andtheywerereallygoingatit,theywerehavingagreattime .Theydon’tusuallygettobangonthecastle .Andtheyworealltheirbaseballbatsdowntolittlenubs .Therewaslikeahandleandalittlenubonit .Andtheycouldn’tbreakthroughtherock .Andtheysaid,“EvilMisterFred,weneedmorebaseballbats .We’verunout .”

Andhewentdownintothedungeontolookformorebaseballbats,buttherewerenonedownthere .Sohesaid,“Oh,man,we’vegottogetmorebaseballbats .”SohecalledtheAcmeStoreofEverythingand

said,“Ineedanotherthousandbaseballbats .”Andtheysaid,“Well,I’mreallysorry,buttheshipmenthasn’tarrivedyet .It’llbehereanydaynow .”AndEvilMisterFredsaid,“Arrrrgh!”

Sohedidsomethinghedoesn’tordinarilydo .Hegavehisminionshammers .Andtheminionssaid,“Oh,boy,boss--hammers!Welovehammers!”Andtheyweregoingtogohammereachother,andhesaid,“Now,now,youdon’thammereachother .Youmakewindowsinmycastle .”

Sotheminionssaid,“Oh,man .”Andtheystartedhammeringonthecastle,andsureenough,theybrokesomeholesintoit .Theyweren’tverygoodholes,buttheymadesomeholesinthecastle .AndEvilMisterFredhadtoactuallykeepaneyeonthemsothattheydidn’tknockthewholecastledown .

Sohesaid,“Okay,nowwe’reready .Wecanhaveourmeetingonhowtotakeovertheworld .”Buttheneverybodysaid,“Ohhhh,it’scoldinhere!You’vegottocoverupthewindows .”Hesaid,“Well,Ijustmadethewindows .Nowyou’retellingmetocoverupthewindows?”Theysaid,“Yeah,coverthemupwithsomethingwecanseethrough .”

SoEvilMisterFredsaid,“Minions,gofindsomethingtocoverthewin-dowswithsowecanseethroughthem .”Sotheminionswentoffand,un-likethem,theyactuallycamebackshortlywithsomething .Itwastheskinofasnake .It’sabig,bigsnake .

Rock-it Science Teacher’s Guide Laser Sound Waves -- Page 10

Story: “Evil Mister Fred's Snakeskin Windows”

Holes in the castle

Snakeskin.

Rock-it Science Teacher’s Guide Laser Sound Waves -- Page 11

Youeverseenasnakeskinlyingaroundwithnosnakeinit?Yeah .Theyshedtheirskinseveryonceinawhile .Theminionsbroughtbackasheddedsnakeskin .AndEvilMisterFredsaid,“Wow!How’dyoudothat?”Andtheminionssaid,“Why,we’resmart,boss .Wejustdidit .”Hesaid,“Boy,oh,boy!”Andhetooksomescissorsandhecutitallup,andheputthesnakeskinoverthebrokenopenareas .AndnowEvilMisterFredhadwindowsinhiscastle .Hewasre-allyhappytohavethat .Andhestartedmakinghisplanswitheverybodyelse,allkindsofweirdpeopleandanimalsandcreatures,abouthowthey’regoingtotakeovertheworld .

Andwhenhewasdoingthis,therewasapurplebirdflyingaround .Maybeabunchofpurplebirdsflyingaround .Likethat .They’repolka-dotted,bytheway .Andtheywereflyingaroundhiscastle,throughthefrontdoor,outthetop,drivingeverybodycrazy .AndEvilMisterFredwastryingtohitthemwithstuff .Buttheywereprettyfast

purplebirds .Andoneofthepurplebirdsalmostgothit--justmissed--andhegotreallymad .HewentandhidinthecornerandhelistenedtoeverythingEvilMisterFredsaid .

ThenhecamebacktoJackandJill .Let’sputJackandJillsomewhere .Theyshouldbelivingoffonaraftintheocean .There .They’vegotasheetforwindpower .ThepurplebirdcametoJackandJill,anditsaid,“EvilMis-terFredisgoingtotakeovertheworld!It’sgoingtobeterrible .He’sgotweapons,he’sgotarmies .You’vegottodosomething .”

AndJackandJillsaid,“Oh,whenishegoingtodoit?Andhowishegoingtodoit?”Thepurplebirdsaid,“Idon’tknow .”SoJackandJillhadtofindout .

Now,EvilMisterFred,whenhe’smakinghisplans,neededmorebase-ballbats .Andtheyweren’tarrivingyet,theywerecomingonaship .Nowwehaveawholeshipfullofbaseballbats .AndJackandJillneedtofindoutwhenthisship’sgoingtocomein,they’vegottostopthebaseballbats,they’vegottofindoutwhathisplanis,andhowtostophiswholeplan .NowifyouwereJackandJill,howwouldyoudiscoverwhatEvilMisterFredisgoingtodo?

Imagination and Brainstorming Time[Students make suggestions](THEREARENOWRONGANSWERS!Whatevertheysay,youshouldreply:“That’sagoodidea,”“Theymightdothat,”etc .Afterbrainstorming,proceedwiththeexperi-ments,thenfinishthestory .)

Andwe’regoingtoleavethis“Tobecontinued . . .”

Purple birds.

Jack & Jill’s raft.

Snakeskin windows.

Ship carrying baseball bats.

Rock-it Science Teacher’s Guide Laser Sound Waves -- Page 12

Wehaveanexperimenttodo .Itinvolvesacupthatsomebodybroke .It’sgotaholeinthebottom,andifyouputyourCoca-Colainthere,it’sgoingtofallout .[First,you’llputyourmouthontheendofthecup]withtheholeinitandmakeyourvoiceloud .Thenturnoverthecupandmakeyourvoiceprobablynotasloud .

Thenwe’regoingtomakeyourcupintoadrum-likething .Tomakeitintoadrum-likething,yousetitonthetable .Youputyourtwosetsoffin-gersintoit[theballoon]soyoucanstretchit .Andthenyoupicksome-oneelseandhavethemputtheirfingerssidewaysandhavethemstretchit .Andthenwebringitoverthecupandsetitdown,andyou’vegotadrum .[Places his mouth over the hole and goes “Ohhhhhhh”.]You’vegotadrumthatdoesweirdthings .

Thenyourdrumneedstohaveastickstucktoit .Yeah,it’sthestick-stucktrick .Sowewantthesticksoit’soutto-wardtheballoon .Itdoesn’tfitverywellthere,butyou’regoingtostickonethere .

Soit’slikeatonguestickingoutoftheballoon .We’llputsomeglueonit .Inthiscase,you’llprobablywanttousealotofglue .That’salotofglue .Andyoustickthestickintheglueandgushitdownalittlebit .Nowyou’vegotastickthat’snotquitestuckbecausetheglueisstillhot .

Thenyourdrumneeds . . . .Oh,look,here’sawholecupofstickymir-rors .There’sastickymirror .Now,wecanstickthemirroranywherewewant,butwe’regoingtostickitontheballoon .Thehardpartisgettingthebackoffofthestickystuff .Andifyou’vegotfingernailsyoucanprobablydoit .Ifyoudon’thavefingernails,youcanuseyourteeth .Ifyourteethdon’twork,youcanuseyourtoes .Ifyourtoesdon’twork,youcanuseyournose .If

youevergetthepaperoff,thenyoustickthestickythingonthemiddleoftheballoon .Thenit’sagoodideatocleanitoff,getallthefinger-printsoff .

Now,you’vegotastick,acup,aballoon,andamirroralltogether .Whatcouldwepossiblydowiththis?Wecouldputaclamponit .Here’saclamp .Thisisacoolclampbecauseit’sgotthisweirdthingthatswivels .Sowe’regoingtoclamptheclamponthestickwiththeswivellythingkindofupwards .Andtheclampwillstaytherebyitself,butit’sbetterifyouglueiton .Sowecansticksomeglueinthegroovesaroundit .Nowwehaveaclamp,andastick,andaballoon,andamirror,andacupwithaholeinit .Whatgoodisthat?

Experiment: “Laser Sound Waves”

Plastic cup with 1” hole in bottom.

It takes two pairs of hands to stretch the balloon .

Use lots of hot glue to attach the stick.

Square mirror in center of balloon.

Rock-it Science Teacher’s Guide Laser Sound Waves -- Page 13

[Student]Alaser .

Okay,we’llputalaseronit .We’llputalaserintheswivelthingandbounceitoffthemirror .Hmm .Let’sseewhathappenswhenwedothat .WhatI’mgoingtodotomakeitsothelaserpensticksbetterisI’mgoingtoputarub-berbandontheplasticclamp . . .andhopeitstayson .Nowwe’vegotarubberbandkindofwrappedaroundtheendsanywayyoufeellike .

Andwe’lltakealaserpen,andwestickitinthereandhopeitstays .Ifitdoesn’tstaygood,we’llputsometapeonit .Andwehavesomealliga-torsonourlaserpen .

[Student]Whatarewegoingtodowiththealligators?

You’regoingtohookthemuptoabatteryandseeifyourlaserpenlightsupornot .There’sabuttononthelaserpen,andifyoupushthebuttonit’lllightup .

Sonowwe’vegotalaserpenthat’slitup .Canyouseeitontheballoon?NowI’vegottherubberbandstuckintheswiveler .Nowwecanbouncethelaserbeamoffthemirrorontoawall .

NowifItalkintoit--hellooooooo .Let’sturnoffthelight .Hel-loooooooo .[Laser beam makes patterns on the wall as the voice varies in pitch and volume.]There’sacertainfrequencythatyouusewithyourvoicethatgetsbig .Ahhhhhhhhh .

Sothat’swhatyou’regoingtotryandmake .Goodluck .Ifyou’renotdoneinthreeyears,we’llsendyouhomeallstarvedanddead .

[Student]Doyouneedthebatterytochangethesoundwaves?

Youneedthebatterytomakethelaserwork .Thebattery’sonlytheretomakethelaserwork .Therearenobat-teriesinthelaserbecauseit’snotagoodlaser .

So,we’llgiveeachofyouacup,andaballoon .Thecupswillbreakifyouscrunchthem,orifyoustandonthem,orsitonthem,orsmashthemonyourneighbor .Don’tstandonorscrunchthemorsmashthem

Add hot glue to keep the clamp on.

Wrap rubber band around clamp.

Laser pen inserted in clamp.

Alligator clips attach to battery.

Attach swivel clamp to craft stick.

Rock-it Science Teacher’s Guide Laser Sound Waves -- Page 14

againstyourneighbor .[In-structors pass out cups and balloons.]Haveyourneighborhelpwithyourballoon--ittakestwotodoit .[Students at-tach balloons to their cups.]

[Instructors set power strips on table and pass out glue guns and craft sticks.]Plugitin .Noweverybodycounttoamillion .Whenyougettoamillion,yourgluegunwillbewarmedup .Oh,youwanttotryandputthemirroronwhileyou’rewaitingforyourgluegun?[Passes out mirrors.]Seeifyoucangetthebackingoffyourmirrorandstickitonyourballoon .Rightinthemiddle .Youneedalltheglueyoucansqueezeoutofthegluegunwhenyoudoyourstick .Ifyou’rejustdabbingitonalittleant-sizepieceatatime,that’snotenough .

[Instructors pass out the rest of the supplies and students assemble their fixtures.]

Therubberbandisnotthatgreatofasolutiontothisproblem,sowe’regoingtotryelectricaltape .We’llgiveyouaboutafootoftape,andwe’llseewhathappenswiththatamount .Andyoucanstickyourlaserin,andwrapitaroundsothatthelaserdoesn’tfallout .Oh,it’sstretchytape,sowhenyouwrapyourtapeon,stretchit .Andwhenwecomearoundtothebuttonpart . . .Iknowwhatwe’regoingtodo .We’llgiveyouthebatteryfirst,checkyourstomakesureitworks,don’tshineitinanybody’seyes .Thenyou’regoingtotapethebuttondownonyourlasersothatit’llstayonwithoutyouholdingit,andthenwe’lltapethelaserontothecup .That’llwork .It’llprobablyjuststaybyfrictionthen .

We’llgiveyoualaserandabattery .Youhaveabatteryandalaser,andthelaserhastwowires .Andyou’llsay,“MisterMac,wheredothewiresgo?”AndI’llsay,“Onthespringythings .”Andyou’llsay,“But,doesitmatterwhichthinggoeswhere?”AndI’llsay,“Yeah .”Thenyou’llsay,“Well,whichonegoeswhere?”AndI’llsay,“You’vegottofigureitout .”Soyouputthemonandpushthebuttononyourlaser .[Demonstrates.] Thatworks .Ifitdoesn’twork,youswitchthemaround .NowI’mgoingtoswitchthemaround,anditdoesn’twork .SothenI’mgoingtoswitchthemaroundagain .Willitworkthistime?Yep,there,itworks .

Someofthebuttonsaresensitive,likethisbutton,ifyoupushitlightlyitturnson .Ifyoupushitharder,itturnsoff .Youpushitlightlyitturnson .Ifyoupushitharderitturnsoff .Isn’tthatweird?

So,whenyouhaveyourlaseronyourbattery,you’regoingtotakeapieceoftapethatwe’llgiveyouandwrapitaroundthebutton .And Wrap electrical tape around laser

to hold button in “on” position.

When you shout into the hole in the cup, the laser makes an image on the wall.

Rock-it Science Teacher’s Guide Laser Sound Waves -- Page 15

wrapiteithertightorloosesothatthelaserstaysturnedon .Ifitturnsoff,youcaneithermakeittighterorlooser .Mineturnedon,soI’llwrapitaroundacoupleoftimes .NowIhavean“On”laser .ThenIcanstickmyOnlaserintomyfixtureandtapeitinplace .[Demonstrates.]

So,you’llgetbatteriesfirst,laserssecond,tapethird .You’llprobablyonlyneedthreeorfourinchestotapethebuttondown .

[Instructors pass out supplies and students assemble lasers. Then the lights are dimmed, then turned off completely so students can see the la-ser images change as their voices change. After a short time, instructor turns on the fog machine to make the laser beams visible in the fog.]

[When the lights come back on, students are instructed to disassemble the laser apparatus (audio quality in this part of the video is poor)].

Takeyourlasersoffofyourcupandpeelthetapeoff .[Lasers, batteries, and alligator clips are returned to the instructor, and students keep the rest of the apparatus.]

Okay,nowweneedtofinishthestory .

Stage fog makes lasers visible.

Rock-it Science Teacher’s Guide Laser Sound Waves -- Page 16

SoJackandJillaretryingtofindoutEvilMisterFred’splan .AndtheycalledtheAcmeStoreofEvery-thingandtheyorderedsomedarkness .TheAcmeStoreofEverythingdeliveredawholebunchofdark-ness .Itcoveredupthewholeplace,asfarastheycouldsee .Andnowit’sreallydark .AndJacksaidtoJill,“Whydidyouorderdarkness?Nowwecan’tseeathing .”AndJillsaid,“Well,whydon’tyouordersomething?”

Jacksaid,“Okay,Iwantalaser .Ilikelasers .”SoJackorderedalaser,andhe’sshiningitaroundalloverinthedarkness .Jillsaid,“That’scool .ShineitatEvilMisterFred’scastle .”SoJackshonehislaserrightatEvilMisterFred’scastle,anditbouncedoffthesnakeskinwindows .

AndEvilMisterFredwastalkingaboutallhiswarplansinside .Andthelaserbeambouncedoffandendedupcomingback,anditmadewigglesontheground .AndJillsaid,“Whoa,thewindow’svibrat-ing!Iwonderwhy .”Andthenshelookedandshewatchedandshelistened,andshesaid,“Icanbarelyhearwhatthey’resaying,butIcanseewhatthey’resayingfromthewigglesontheground .”Andshe

End of Story * DO NOT * present this part of the lesson until after the experiments!

Darkness covered everything.

The laser beams from the raft bounced off the snakeskin windows and made wiggles on the ground.

Rock-it Science Teacher’s Guide Laser Sound Waves -- Page 17

End of Lesson

If y0u have questions about this lesson, please ask them through the online Teacher Support Forum on our web site.

andJacklookedatthewigglesandtheysaid,“Oh,he’stalkingaboutcomingwithbaseballbatsandhit-tingeverybodyoverthehead .Andthere’sashipwithbaseballbatsoutinthebay,andassoonashegetsthem,he’sgoingtoattackthewholeworld .”

AndJackandJilllookedaround,andtheycouldn’tseetheshipinthedarkness .SoJackshinedhislaserbeamontheshipandwiggleditbackandforthreallyfast .Andhesawtheshipoutthereinthedarkness,andhesaid,“Thatmustbeit--thebaseballbatship!”Andthecaptainoftheshipsawthelaserbeamshiningathimfromtheshore .Andhesays,“Ah,that’sthesignal!We’resupposedtotakeallthebase-ballbatsandthrowthemoverboard .”EvilMisterFredwasgoingtohavehisminionsrowoutandgrabthemastheywerefloatingaroundintheocean .Sohetookallthebaseballbatsandthrewthemintotheoceanandsailedoff .

Andnow,EvilMisterFred,ofcourse,doesn’tknowthis .JackandJillsawthemdothatandtheysaid,“Whatarethoseguysdoing?”Sotheytooktheirraftoutthereandtheygatheredallthebaseballbats,andtheytookthembackhomewiththem .AndEvilMisterFredcouldn’tinvadetheworld .Hegotreallymad,andalltheguysthatwerewithhimweresaying,“Whatkindofplandoyouhavehere?You’vegotnoweapons .”AndtheystartedbeatinguponEvilMisterFredbecausehedidn’tknowhowtoplanawar .Andtheyalllivedhappilyeverafter,exceptEvilMisterFred .