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1、NuclearName:_____________________________________Page3of3PhETSimulation:NuclearFission2?eachLearningGoals:Aftercompletingthisactivity,youwillbeabletoexplaintheconceptofa“chainreaction”andhowitappliestonuclearfissionofUranium.Youwillalsobeabletoexplainthepurposeofthecontrolrodsinanucle
2、arreactor.Directions:·Gotothewebsite:http://phet.colorado.edu/simulations.·Clickon“Work,Energy,andPower”onthelefthandside·Choosethesimulationtitled:NuclearFissionandthenselect:“RunNow”.Fission:OneNucleus:2?each.Selectthe“Fission:OneNucleus”tabatthetopleft.Experimentwithshootingtheneut
3、rongunandwatchingwhathappens.Thenanswerthequestionsbelow.1)WhathappenswhentheU-235nucleusis“hit”withaneutron?Therearetwostepshere-describethembothinasmuchdetailasyoucan.ChainReaction:Selectthe“ChainReaction”tabatthetop.Experimentwithchangingthesettingsandshootingtheneutrongunandwatchw
4、hathappens.Thenanswerthequestionsbelow.2)SettheinitialnumberofU-235nucleito100.Whathappenswhenyoufiretheneutrongun?3)Explainwhatmakesthisa“chainreaction”.4)SettheinitialnumberofU-238nucleito100.Explainwhathappenswhenyoufirethegunandifthisisachainreactionornot.5)SettheinitialnumbersofU
5、-235nucleiandU-238nucleitothenumbersinthetablebelow.Recordyourresults.7Pts.U-2351007050300U-2380305070100%of235Ufissionedafter1firing#firingsrequiredtofissionall235UN/A6)WhathappenstothereactionastheproportionofU-238nucleiincreases?7)Ifyouweretryingtodesignthemostefficientfissionreact
6、orpossible,whatratioofU-235toU-238wouldyouwant?Explainwhy.NuclearName:_____________________________________Page3of3NuclearReactor:Selectthe“NuclearReactor”tabatthetop.Experimentwithchangingthesettingsandfiringtheneutronsandwatchwhathappens.Thenanswerthequestionsbelow.1)Thebargraphsont
7、herightofthedisplayshowthe“PowerOutput”andthe“EnergyProduced”.Whatisthedifferencebetweenthesetwoquantities?2)Watchverycloselytothefissionreactionsastheyhappen.Specificallywatchhappenstothelooseneutronsafterthereaction.a)Whathappensiftheneutronshitanothernucleus?b)Whathappensiftheneutr
8、onshi
