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ID:10257203
大小:418.50 KB
页数:10页
时间:2018-06-14
《gre物理sub题目精选解答》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、电磁学1.AFastchargedparticlepassesperpendicularlythroughathinglasssheetofindexofrefraction1.5.TheconeofCerenkovlight,emittedintheglassatangleθ,isincidentontheglass-airinterfaceatthecriticalanglefortotalreflection.Whatisthespeedoftheparticle?answer:2.answer:D3.answer:E一些简单的量子力学题:1.Aparticleofchar
2、geeandmassmistrappedinaone-dimentionalsquarewellofwidth2awithimpenetrablewalls.Thewallsarelocatedatx=−aandx=a.(1)Ifthequantummechanicalstatesarelabledbyn(n=1isthegroundstate),whatistheexpectationvalueofx^2forverylargen?answer:a^2/3(2)AsmallelectricfieldofstrengthE_0isappliedinthexdirection.Wh
3、atisthechangeoftheenergyofthefirstexcitedstateofthisparticleduetothiselectricfield?(Assumethatthetotalpotential,duetothewallsandtheelectricfield,is0atx=0.)answer:02.ThewavefunctionwhereAandbarerealconstants,isanormalizedeigenfunctionoftheSchrödingerequationforaparticleofmassMandenergyEinaoned
4、imensionalpotentialV(x)suchthatV(x)=0atx=0.DeterminetheformofthepotentialV(x)answer:3.answer:E统计:1.answer:B2.answer:BA一些简单的粒子物理题和狭义相对论1.Thehalf-lifeofamesonatrestis2.5×10-8second.Abeamofmesonsisgeneratedatapoint15metersfromadetector.Onlyhalfofthemesonslivetoreachthedetector.Findthespeedofthem
5、esonanswer:2.3.Abeamofparticlesisincidentonathintargetofthicknesst.Ifthecrosssectionpernucleusforascatteringoftheparticlesbythenucleioftheofthetargetisσ,andthenumberofnucleiperunitvolumeisn,whatisthefractionofparticlesscattered?answer:ntσ4.Aprotonbeamisincidentonascatterer0.1centimeterthick.T
6、hescatterercontains10^20targetnucleipercubiccentimeter.Inpassingthroughthescatterer,oneprotonperincidentmillionisscattered.Calculatethescatteringcrosssection.answer:10^-25cm^2
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