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1、2007陕西课改实验区理化试题(物理部分)2007,Shaanxiexperimentationareaphysicsandchemistryexaminationquestions(physicalpart)Asinglechoice(3pointsperday,atotalof15points)5.Electromagneticwavesarewidelyusedinlife・ThefollowingistrueaboutelectromagneticwavesAandmobilephonesusee
2、lectromagneticwavestocommunicateinformationBandpracticalmicrowaveovenswillnotproduceelectromagneticpollutionC,thehigherthefrequency,thelongertheelectromagneticwavelengthD,theelectromagneticwavepropagationspeedintheairisabout340m/s6.Thefollowingdiagramshow
3、stheworkingprincipleofthemotor7.thereisakindofpiezoelectricplasticfilm,undertheactionofpressure,thesurfacewillproducevoltage・Ifitwillbeusedinmicrospeakerormicrophone,theelectricalsignalintosoundorvibration,thevibrationsoundintoelectricalsignals;inaddition
4、,whenitisheatedwillgenerateelectricity,canbeusedfortheproductionoffirealarmdevice.Theenergyconversionprocessthatisnotinvolvedintheaboveinformat!onis()A,mechanicalenergyisconvertedtoelectricityB,electricenergyistransformedintomechanicalenergyCcanconvertint
5、ernalenergyintoelectricenergyD,internalenergyisconvertedtochemicalenergy8,thefollowingprocessdoesnotinvolvechemicalchangeis09,thefollowingpracticesdonotmeetthe"energy-savingemissionreduction，/thisrequirementis()A,theuseofhydrogenfuelcellstopromotethepower
6、ofthebusB,comprehensiveutilizationoffossilenergyCburnalotoforangesinthefieldsD,turnoffthepowerswitch,andclosethefaucetFive,fillintheblankswiththemapping(6items,20)23,(each1points,atotalof2points)wecandistinguishthebellsandwhistles,mainlybecauseofthesetwok
7、indsofsounddifferentpitchisdeterminedbyabodyofsoundvibration・24,(2pointsperhour,4points),XiaoMingandhisfamilytogethermeasuredthetemperatureofhisfamilyandthetemperatureinthepoolatdifferenttimesoftheday.Accordingtothedatarecorded,hemadeapictureofthetemperat
8、urechangingwithtime,asshown.Ascanbeseenfromtheimage,watertemperaturevariationofamplituderatioofamplitudetemperaturechange,themainreasonisthelargewater.24onthe25figure23,(each1points,atotalof3points)isadevicethatthes
