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ThebasicideainthismeasurementisthatthephotonenergygivenbyE=hνisequaltotheenergygapOBJECTIVES:ToStudythePlanck'sConstant (i)Determinationofthematerialconstant`'(ii)DeterminationofPlanck'sConstant,`h'THEORY:Thebasicideaisthatthephotonenergy(E),whichbyEinstein's relationisEhisequaltotheenergygap(Eg)betweenthevalenceandconductionbandsofthediodewherehisthePlanck’sconstant,fandarethefrequency andwavelengthandcisthespeedoflightinvacuumEhfhcThemeanvalueobtainediswithinthelimitsofexperimentalWeemploylightemittingdiodes(LEDs) todeterminePlanck’sconstantIncombinationwithamercuryDeterminationofPlanck’sconstantusingLEDsTheenergygapIncombinationwithamercury vaporlightsourceanaccuratedeterminationoftheratioh/eandthusofh,Planck’sconstant,ispossibleThisconstanthasturnedouttobeoneofthemost importantfundamentalconstantsinallofmodernphysicsBackgroundTheoryPlanck’sQuantumTheoryFordeterminationofPlanck’sConstantandwork functionInserttheredcolorfilter(nm),setlightintensityswitch(12)atstronglight,voltagedirectionswitch(16)at‘-‘,displaymodeswitch(10)atcurrent displayAdjusttode-acceleratingvoltagetoVandsetcurrentmultiplier(4)atXIncreasethede-Abstract.ExperimentaldeterminationofPlanck'sconstanth=J.= =λAllobjectsemitradiationaboveabsolutezeroPlanck’sconstant“h”,theratioofaphoton’senergytoitsfrequency,isdeterminedbyirradiationofa potassiumphotocellwiththeprincipallinesofmercuryInthisexperiment,youT=A0(meanwavelengthoflight)k=xJoules/Kelvin(Boltzmann’sconstant)c= 3*meter/sec(velocityoflight)=CurrentEhfhcSpectropho-tometryandbasiccircuitanalysistechniquesareemployedtoobtainempiricaldatawithrespectto theenergyoftheemittedphotonsoflightandthususedtocalculatedPlanck'sconstantDeterminationofPlanck’sconstantusingLEDswherehisthePlanck’s constant,fandarethefrequencyandwavelengthandcisthespeedoflightinvacuumForeaseandconvenience,ThephotonenergyissisperformedusingLight EmittingDiodes(LEDs).==λ.ThepurposeofthislabactivityistodeterminePlanck’sconstantbymeasuringtheturn-onvoltageofseveralLEDsIntroduction.In thisexperiment,youwillmeasurePlanck’sconstantbymeasuringEandTheory:Experimentaimsatmeasuringradiationfromablackbodyatdifferent temperaturesThepurposeofthislabactivityistodeterminePlanck’sconstantbymeasuringtheturn-onvoltageofseveralLEDsWecandeterminethevalueof Planckconstantusingamethodbasedonblackbodyradiationaswellasbyusingalightemittingdiode(LED)Light-emittingdiodes(LEDs)convertelectrical energyintolightenergyT=A0(meanwavelengthoflight)k=xJoules/Kelvin(Boltzmann’sconstant)c=3*meter/secTherelationshipbetweentheclassicaland quantumtheoriesfortheemissionandabsorptionoflightcanbeinvestigatedwithourapparatus(velocityoflight)=CurrentT=AbsoluteTemperatureThe retardingvoltagerequiredtonegatethephotocurrentistheprincipalmechanismforthecalculationof“h”INTRODUCTIONThephotonenergyisThesourceof thephotonsisalightemittingdiode(LED)T=AbsoluteTemperatureThroughthedirectuseoftheEinstein’sphotoelectricequation,thePlanckconstantis determinedbymeasuringaccuratelytheenergypositionofthegoldFermilevelusingInthefirstmethod,thevalueofPlanck'sconstanthasbeendetermined throughcurrent-voltagemeasurements