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1、波长'频率和波速教案()Three,wavelength,frequencyandwavespeedinstructionalobjective1.knowwhatthewave，swavelengthis,andcanfindthewavelengthofthewaveintheimageofthewave2.knowwhatisthecycleofwavepropagation(frequency),andunderstandtherelationbetweentheperiodandfrequency(th
2、efrequencyoftheparticlevibration)3.understandthefactorsthatdeterminetheperiod(frequency)ofthewave,andknowitscharacteristicsduringwavepropagation4.understandthephysicalmeaningofwavelength,cycle(frequency)andwavevelocity,andtherelationbetweenthem,andapplythisre
3、lationtocalculateandanalyzepracticalproblemsAIDSWavedemonstratorandteachingmicrocomputersoftwarefordemonstratingwaveimagesteachingprocessIntroducingnewcoursesInphysics,somephysicalphenomena,processandrules,needtousephysicalquantitiesaredescribed・Also,themecha
4、nicalwaveanditspropagationprocess,alsoneedsomephysicalquantitiesaredescribed・Basedontheimageinasectionofourknowledgeandunderstandingofthewave,inthisclass,westudyandresearchtodescribethewaveseveralphysicalquantities,namelywavelength,frequencyandvelocity.Takean
5、ewcourse[blackboardwriting]thirdwavelengths,frequencies,andwavevelocitiesAwavelength(lambda)Intheteachingmaterial105figurecanbeseenbyaparticlevibrationparticle1to13,the13particlevibration,particle1onecompletevibration,andvibrationoftwoparticles・Itisexactlythe
6、same・Thatistosay,thetwoparticlesatanymomentinvibration,thesizeanddirectionofdisplacementtheequilibriumpositionisalwaysequa1.Weputbetweentwosuchparticledistanceiscalledwavelength・[blackboardwriting]1.whatisthewavelengthofthewave?Inawavemotion,thedistancebetwee
7、ntwoadjacentparticles,alwaysequaltothedisplacementoftheequilibriumposition,iscalledthewavelengthofthewave・Forthephysicalquantityofthewavelength,wealsoneedtocombinetheimageofthewavetofurtherunderstanditTounderstandthemeaningof''displacementisalwaysequal".Heret
8、herequirementisallequal.Figure10-10showssuchasEF.Twoofthetimedisplacementisequal,butafteraperiodoftime,thedisplacementisnotnecessarilyequal,soEF,thedistancebetweentwopointsisnotequaltoone
