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时间:2020-03-26
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1、全真题三1.Whichofthefollowingmeasurethechargeofanqelectionindependentlyofitsmass?(D)−8πR2(A)Millikanoil-dropexperiment(B)Thomsonexperiment2Rq2(C)Franck-Hertzexperiment(E)34πR(D)Cyclotronresonance1(E)Comptoneffect4.Whatisthepotentialofthesphere?(Assumethat2.Thelongestwavelengthx-raythatcanundergothepo
2、tentialiszeroataninfinitedistanceaway.)Braggdiffractioninacrystalforagivenfamilyofqplanesofspacingdis(A)R1d(A)4qd(B)(B)R22(C)dqR1(D)2d(C)R2(E)4dqR2Questions3-4(D)R1R2R111(E)q(+)RR12q5.ApersonstandingonthesurfaceoftheEarththrowsaball.Theballleavesthethrower’shandwithinitialvelocityviandhasfinalvel
3、ocityvfjustbeforeitiscaught.Ifairresistanceisnegligible,whichofAconductingsphereofradiusR2hasacocentricthefollowingdiagramscorrectlyrepresentsasphericalcavityofradiusR1,asshownabove.Thepossiblesequenceofvelocityvectorsfortheball?spherehasnocharge.However,thereisachargeqinthecenterofthecavity.3.Wh
4、atisthesurfacechargedensityontheinnersurfaceofthesphere?q(A)−24πR1q(B)−28πR1q(C)−24πR21全真题三Verticalmh(A)HorizontalVertical6.Asshownabove,ablockofmassmisreleasedfromrestatadistancehaboveaverticalmasslessspringwithspringconstantk,whatisthemaximum(B)Horizontalkineticenergyoftheblock?(A)mgh221mg(B)mg
5、h+4kVertical221mg(C)mgh+2k(C)Horizontalm2g2(D)mgh+k(E)2mghv=0VerticalBmvMBeforeAfter7.Abulletofmassmtravellingatspeedvstricksa(D)HorizontalblockofmassM,initiallyatrest,andisembeddedinitasshownabove.Howfarwilltheblockwiththebulletembeddedinitslideonaroughhorizontalsurfaceofcoefficientofkineticfric
6、tionµkbeforeitcomestorest?Vertical2m+Mv(A)()()m2µgk2(E)Horizontalm+Mv(B)()()M2µgk2全真题三2m+M2v(C)()()M2µgk2mvi(D)()()am+M2µgbik2m2vc(E)()()m+M2µgkee12rP9.acoaxialcablehavingradiia,b,andccarriesequalandoppositecurrentsofmagnitudeiontheinnerand8.Inthecircuitillustratedabove,thepointmarkede1outercondu
7、ctors.Whatisthemagnitudeoftheisraisedinstaneouslyattimet0fromzerotoafixedmagneticinductionatpointPoutsideofthecableatapositivepotential.Ife2isconnectedtoadistancerfromtheaxis?high-impedanceD.C.oscilloscopeinput,thegrag
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