rRIroNG rHPr DAo DUY Til of nrr firtl o4r Hgc r,.A,x nrtj v Ni,m zoro Mdn thi: VAt ry, mdi.L Thdi gian ldm bdi: 90 phtit; kh6ng kii thin gian phdt di. M5 .ra thi 209 Hg, tdn thi sinh: 56 b6o danh: Ciu 1: MQt s6ng ngang truyAn theo chiAu duong tqc Ox, c6 phuong tinh s6ng le u=2cos(4nt-O,02rx);trongd6uvixtffibengcm,ttinhbAngs.S6ngniyc6budcs6ngld A. 50 cm. 8.200 cm. C. 150 cm. D. 100 cm. Cdu 2: Nguy€n tic san xudt ddng diQn xoay chiAu ld A. ldm thay t16i tu thdng qua mQt m4ch kin. B. lAm di chuy6n mqch kin trong tir truirng theo phuong song song voi tu truirng. C. ldm thay tl6i tu th6ng qua mQt mach kin m$t crich zudn hoan. D. iam thay d6i tir truong qua mQt m4ch kin. CAu 3: MQt con l6c ld xo dao dgng diAu hda vsi bi6n dd 6 cm. Lric t = 0 , con 18c qua t tri c6 li d0 x = 3J-2cm theo chidu duong voi gia ti5c c6 d0 lon ,lZ t**f t2 . Phucrng tinh dao dQng cia con lic lA A. x=6cos9t(cm). c.x=6"or[!*1\' ' / n\' \3 4J(cIn)' D'*=6cos[3t+;J(cm) CAu 4: Trong mgch dao dQng diQn tu LC, niiu di€n tich ctrc d4r t€n tg diQn ld Qo ud cudng tlQ dong diQn cgc d4i trong m4ch la I0 thi chu k) dao dQng diQn tu tong mpch li A. T= zn!. B. r=2n9. C. T= znLC. D. T=2re6I6. Qo Io Cdu 5: D6 thu dugc quang ph6 vph hdp thrr thi A. nhiet d0 cua drim hcrn hay khi hdp thU phai bdng nhiet dq crla ngudn s6ng ting. B. nhiet dQ cua d6m hsi hay khf h6p th\r phai nh6 hon nhi-Ct d6 cria ngu6n sring ffing. C. kh6ng php thuQc vio nhiQt ttQ md chi can ap su6t cria dr.m hoi hay khi h6p thg th6p. D. nhiet dQ cria d{m hoi hay khi h6p thu phni lsn hcrn nhi€t dQ cua ngudn s,ing tring. CAu 6: Dit m$t diQn 6p xoay chiAu u = Ugcoscot vdo hai ban cua tU dien C. Gqi U ld di€n 5p'hi€u dUng d hai dAu doan m4ch; i, Is, I tan luqt ln gi6 td tuc thoi, gr5 fi clrc d4i vd gi6 tri hi€u dirng cria cuirng dQ ddng di6n trong m4ch. H€ thirc li€n lgc ndo sau d6y dung? o. l4-41=t e.4*4=r c.4**=r n. $*|=r "'lu3 4l u6 16 tJz' rz "' uo 'Io " CAu 7: Tii5ng dn cua mQt mdy bay c6 mric cutrng d6 6tn Lr = 120d8. Mu6n gidm tii5ng dn toi mirc chlu dugc ldl,2 = 100dB thi m5y bay phii gidm cuong d0 6m: A. i000lan. B. 200lan. C. 10ltu. D. 100 Hn. CAu 8: Cho m4ch RLC n6i ti6p C = 318FF , R bii5n eOi. pien 6p cua m4ch u = UocoslO0nt (V) . COng su6t ti€u thU cua mach dat 916 tr! cr;c dai khi R = R0 = 50Q. Cdm khrlng cira cuQn day bang A. 60Ct. B. 40c). c. 1000. D. 800. CAu 9: MQt 6ne Cu-lit-gio phrit tia X c6 bu6c s6ng ngan *at ta 50 nq. n6 tang khA 4eng dAm xuy€n cua tia X, ta tdng dien 6p giira an6t vd catdt th€m 25%.Bulc s6ng ngin nh6t cua tia X do 5ng phrit ra khi d6 ld A. 12,5 nm. B. 40 nm. C. 60 nm. D. 125 nm. B. x =0,",(i-f)t.,1 Trang 1/5 - Ma d€ thi209 ,r,M;: 1,4,{f-Ah^, ciu 10: cho mach RLC theo thri t.u mic noi ti6p voi nhau. Biiit u = 300 v, flc = 140 v. Dong diQn rE pha so voi u mQt g6c rp ( cos g = 0,8 ). DiQn 6p hiQu dUng URr c6 gi6 hi A. 100 v. 8.300 v. c.400 v. D.200 v. Ciu 11 : HiQn tuqng mSt v4ch trong quang ph6 ph6t x4 trd thinh v4ch tiii trong quang ph6 hdp thg h A. s1r tin sic rinh sring. d. s1r tlao vach quang ptr6. ' C. str giao thoa anh sring dcm sic. D. s1r nhiEu xa 6nh s6ng. CAu 12: TOc dO cua mQt v{t dao dQng diAu hda khi qua vi tri c6n beng ld 20cm/s. Khi d6ng nlng vi thiS ning cria vQt beng nhau thi vQt c6 tdc dQ ld t . A. 10.,6cm/s. B. 10cm/s C. 5cm/s. D. l0"Ecmls. Ciu 13: Philt biiiu nio sai khi n6i vA ap alng mdu Bo vio nguy6n tu hi&o? A. Ban kfnh c6c quf d4o dtmg uing ti l€ vai binh phuong cria cdc si5 nguy€n li€n titip. B. Tr4ng th6i kfch thich c6 nEng lugng cdng cao thi r4ngthdi 116 cang kdm bAn virng. C. Ndng lugng cria nguy€n tu chi li tlQng nAng cria electron. D. Tr4ng th6i cs b6n r.rng vdi nguy€n tu & t4ng thii drmg c6 ndng luqng thdp nhdt- Ciu 14: MQt proton (mo ) c6 vfn t5c v bin vdo h4t nhdn ]fi a,-g y6n t4o ra 2 fut nh6n giiing nhau (m*)voivfntiicc6d0lcmbdng v'vicirnghgrpvdiphuongtoicuaprotonmQtg6c 60".Gii{tricria v' la n'= S*Po Cdu 15: Phat biCu nio sau rldy kh6ng tlung? A. Tia hdng ngo4i vi tia tu ngo4i ddu tiic dqng l€n kinh 6nh. B. Tia hdng ngo4i vd tia tu ngoai c6 ban ch,5t la s6ng diQn tu. C. Tia h6ng ngo4i vd tia tu ngo4i dAu c6 tric dgng nhiQt. D. Tia h6ng ngo4i c6 tAn s6 lon hcn tAn s5 cria tia tu ngoai. Ciu 16: Tim phdt bi6u sai. Trong m4ch dao rlQng tg do LC A. C6 sg chuydn h6a qua lai giiia ndng lugng cliQn tnrcrng vi ndng luqng tu trutmg nhmg t6ng cua chfrng duo. c bio toan. B. NXng luqng dign trusng vd ning luorig tu truirng c6 cung gi6 t{ clrc dai. C. Neng luqng diQn truong vi ning luqng trr trunrng bii5n aOi tuen hoAn theo thoi gian vsi ten s6 ^l +_ ^ 2rJLC' D. Ning lugng diQn truong t{p trung d tC di€q nnng luqng tu trudng t{p trung 6 cuQn cim. Ciu 17:DognmachxoaychiAuRLCn5itiiipv6i L=2/r(H); C=31,8FF;Rc6g16tri xdcdinh, i = 2 cos (l 00 nt - n / 3)(A,) . ni6u thric cua ulc la a uNre = ooocos[100.*"t-;)(v). B. uNre = ooocos(100"t+;)(v) \ c. ''s =zoocos[r.o,rt+I)rvi- D. uv* =zoocos(roo"-;)t"l \ 6./t ' CAu 18: MQt m4ch di$n xoay chiAu khdng ph6n nhrinh gdm: dign t0 thuin R, cuQn ddy thuAn cim L va tu di€n Q. Dit vdo hai qlu dogn m4ch hiQu di€n thiS xoay chiAu c6 tin si5 vd hiQu di€n thri hi€u dung kh6ng A6i. Otrng vdn kd (von kri nhi€t) c6 diQn kd i.it toq hn tuqt do hiQu di€o the d hai deu do4n m3ch, hai dAu tlf di€n vi hai dAu cuQn ddy thi si5 chi cria vdn ki5 tucrng ung ln U, Uc vd U1. gi6t u - Uc = 2UL.He s5 cdng su6t cua m4ch rliQn ld A. v,= fh*v. B. mp .6 A. costt}=- ,2 . C. Y'=Il,v mp m-v [. vt = -! mx mx c. coss =+ D. "orr = 1. '2 B. cosq=1. Trang2/5 - Ma dA thrz}g CAu 19: Hai di€m S1,S2 cdch nhau 16 crn trdn mat mQt ch6t lOng dao dQng voi phuong trinh uq=usr=acoslOOlrt.VantdctruyAns6ngt6nm{tchdtl6ngli0,4mls.Gita51,S2 c6baonhi€u diiSm dao ttgng vdi bi€n rtQ cpc d4i? A.39. 8.41. c.40. D.20. ciu 20: MQt vflt nhd dao dQng diAu hda theo mQt tgc co ai*. ph6t bicu ndo sau tl6y oung? A. Qug tl4o chuy6n dQng cria vft ld mQt doanhang. B. Lgc kdo vd tric. dlrng vio vgt kh6ng ctdi. C. Qu} t14o chuydn dQng cria v4t h mQt clulng hinh sin. D. Li d0 cria v{t ti lQ v0i thoi gian dao riQng. Cdu 21: Tim ph6t bi6u nio sai vA phan rmg nhi€t hach? A. t6a ndng luqng nhi6u hcln ndng luong phan rmg phdn h4ch khi c6 cung mQt lugng nhi€n liQu. B. ld str ki5t hqp hai hat nhdn nhe thdnh m-Ot h+ nhdn nqng hon vd t6a ra ndng luqng. C. phan ung ki5t t6a nhiQt ldm n6ng m6i truong xung quanh n€n ta ggi ld phan trng nfriet hech. D. Con ngudi d6 thirc hiQn dugc ph6n ung nhi€t hqch kh6ng ki6m so6t dugc d6 li su n6 cria bom H. Ciu22: Chom4chn6itiiSpRCc6 uAB=l00cos(l00nt+n/4XV).D6lQchphagrriauvdild n/6. Cuong dd hiqu dUng I = 2A. Bitiu th&c cria ddng di€n ld A. i=2Jico,(,oo**-#)(^). B. i = zcos(roo*-ff)tel c. i zJl c, (t oo* * fr)to) D. i =J7.o,(roo*-#)(^) Cdu 23: Ddy AB ddi 24 cm cdng ngang, hai dAu A vd B cO Ainb khi c6 s6ng drmg thi tai M qich B 14 cm ld bgng s6ng th{r 4. 56 bung t€n ddy ld: A 8. B. s. c.4. D.6. Cda24; Tim ph6t bi6u ndo sai vd lgc hat nh&r? A. chi ld lpc hrit. B. thuQc loer lUc tuong trlc manh. C. c6 fi s6 lsn hon lgc dAy cul6ng gita c6c proton. D. ld lgc h6t khi c6c nucl6n d gdn nhau vd ld lgc &y khi c6c nucl6n 6 xa nhau. Ciu 25: MQt s6ng lan tuy6n dgc theo mQt duong thdng. Phucrng tinh dao dQng d ngudn O ld u0 =acosot. Mdt diem nim ten phucrng truyAn s6ng crlch xa ngudn mQt phin ba bu6c s6ng d thoi diCm bang mQt nta chu k! c6. d0 dich chuydn h 5 cm. Bi€n dQ dao dQng bdng 4.7,7 cm. 8.8,5 cm. C.5,8 cm. D. 10 cm. C0u 26: Trong thi nghiQm giao thoa vdi hai k*ie Idng c5ch nhau 2 mm, khodng crich tu hai khe d6n min ld 1,8 m. Anh s6ng don sic duqc dtrng c6 bu6c s6ng 0,6pm . BA rdng vung giao thoa trdn min ld 2 cm. 36 v6n sring thdy dugc tr€n mdn td 4.37. 8.3. c.4. D.19. Cia27z Ph6t bi6u nio sai khi n6i v6 s6ng co hgc? A. S6ng truy€n tong chdt lOng ld s6ng dgc. B. S6ng tluyAn trong ch6t kfii li s6ng ngang C. T6c dQ truyAn s6ng cflng 1A t6c d0 lan truy€n bitin dang cua mdi truong. D. Trong thgc ti5, cang xa tAm dao dQng bi€n dQ s6ng cing nh6. Cdu 28: MQt mach dao dQng di€n tu li tuong g6m cuQn cnm thunn c6 dQ t.u cim L vd tU diQn c6 tti€n dung C. Trong m4ch dang c6 dao dQne di€n tir t.u do vd diQn tich clrc <l4i t€n m-6t bin tg iliQn ld qe. Cuong dQ ddng tliQn cgc dgi tong m4ch ld A. _d_ LC "' or\E' c. +q D. q0 . VLC LC Ci,u29: HiQn tuqng cQng hudng th6 hign cing 16 ndt khi A. h.rc c6.'n, ma s6t cria m6i truong nh6. C. tan s6 cua lgc cudng bric lqn. B. bi6n dQ cua h.rc cu0ng brlc nh6. D. d0 nh& cia m6i trucmg cang lcrn. Trang3l5 - Ma dc thi 209 CAu 30: Thuytit tli6n tu Mic-xoen d6 c{p ddn A. Cry tuong trlc cria ttiQntruirng voi ttiQn tich. B. Chi tuong tic cua tt trulng voi ddng dign. C. MOi quan hQ gita diQn truimg vd tu truirng. D. Chi tuon! tic cua diQn * truttne oOi ei6o ti"h. Ciu 31: MOt t6m kim loei c6 gioi h4n quang di€n ld 0,66pm dugc chii5u bric x4 c6 budc s6ng 0,33pm thi cdc quang <tiQn tu c6 tdc d0 ban {lu cuc elei ld v. D€ c6c electon c6 v{n t6c ban diu clrc dai H .,Ev thi phni chii5u bric x4 c6 bu6c s6ng bdng A. 0,l7pm. B. A,22W. C. 0,25ptm. D. 0,23pm. Ciu 32: Cuong tlQ ddng di€n qua mach ld i =Id c9s(100rt-n/4)(A). rsi ttrtri di6m t:0,06 s, cuirng dQ ddng dign c6 ei6 hi bing 0,5A. Cuirng dQ hiQu dgng cria ddng di€n b6ng r. {ze. 8.0,5 A. c. Jztze. D. 1A. Ciu 33: Trong quang phd cua nguy€n tri hidro, vpch thrl nhAt va tht tu cua ddy Banme c6 budc s6ng hrong img ld l,l = 0,65639m vd 1,2 = 0,4102pm . Bu6c s6ng cria vpch thri ba trong d6y pasen li A. 1,875lprm . B. 1,826pm. C. 1,218prm. D. 1,0939pm. CAu 34: MQt v{t dao dQng ili€u hda c6 phuong tinh x = tO.or[,3 \ - \, r:tJ(cm). vit di qua vi tri c6li dQ x = 5cm nn tnn nhit theo chiAu duong vdo thsi iti6m nio? 4.11T/t2. B.T/6. c.5T/6. D.T/T2. Ciu 35: MQt chdt di6m dao ttQng diAu hda theo phuong tinh x =2,5cos(10r*+n/2)(cm). f6c d6 hung binh cua ch6t dirim trong mQt chu k| dao ilQng ld A. 50 m/s. B. 50 cm/s. C. 5 m/s. D.5 cmls. Ciu 36: Gioi han quang ttiQn cua m5i kim loai ld A. Bu6c s6ng ngin ntrdt cua brlc x4 chi6u vio kim lo4i d6 dd gey ra hiQn tuqng quang diQn. B. C6ng nh6 nh6t dung d€ br?t electron ra lhdi kim loai tl6. c. Bu6c s6ng ddi nh6t cu3 brlc x4 chi6u vdo kim lo4i d6 d6 gay ra hiQn ruqng quang diQn. D. Cdng lsn nh6t dtrng tl€ but electron ra kh6i kim loqi d6. CAu 37: Thf nghiQm IAng vd giao thoa 6nh sring hai khe c6ch nhau 3 mm vd c6ch mdn 3 m. Anh sring t6i c6budcs6ngnimtrongd6i 0,4lpm-0,65prm,S6Uricx4c6vAnditeimQttil6mtr€nmdnc6chvans,ing trungtdm 3 mm ld 4.2. 8.4. cflu 38: MOt mau qudng chria ctr6t ph6ng xa Xedi lltcr.DQ ph6ng x+ cria mdu ld Ho =3,3.10eBq. Bii5t chu k' ben 16 cua Cs ld 30 nZrn. fhOi tuqng Cs chria tong mdu qu{ng ld .d 10 mg. B. I mg. C. l0g. D. I g. Ciu 39: Khi chiiSu rinh sring c6 bu6c s6ng l,=0,4pmvio cat6t cua td bdo quang eliQn thi e bfrt ra c6 vomax = v , n6u chi6u L'= 0,75L thi vg** = 2v. Budc s6ng gi6i han cua cat6t ld A. 0,42pm. B. 0,48pm. C. 0,5lp,m. D. 0,45pm. Ciu 40: Trong dao ttQng diAu h6a" dO l€rn gia t5c cua vgt c. s. D.3. A. kh6ng thay d6i. C. grem khi gr,i ti vfln tric cua vft grdm. B. teng khi 916 ti v{nt6c cua v{t tring. D. gem khi gd tri van ttSc cria vflt tdng. Ciu 41:.Cho m4ch RLC n6i tiiip dangtrong tinh tr4ng cQng huong. Tdrrg den tin s5 ddng <li€n, git nguy€n tdt cd cfuc th6ng s6 mec. phit Ui6u nio sai? A. H€ s6 cdng su'At cua mach giam. B. Hi€u thiS hiQu dtrng t€n diQn rd giem. C. Hieu tniS UiQu dtmg h6n tU teng. D. Cudrng dQ hiQu dirng cua ddng giem. C0l42: Mricndnglugng En trongnguy€ntuhidro<lugcxicdinhboi En=-13,6/n2. Khielectron nhiy tu qui d4o tht tu vd qui d4o thrt hai thi nguy€n tu hidro ph6t ra btrc xg c6 bu6c s6ng L9. Ntiu electron nhny ft qui dao tht ntun vd qui dao tht ba thi budc s6ng cria birc x4 ph6t ra c6 budc s6ng A.ro. n.ry c.6'!-0. D.27Lo. 28 256 20 Trang4/5 - Ma de thi 209 Cdu 43: EQ co chidu ddi cria mQt o[i thudc c6 chiAu ddi ri€ng 30 cm, chuy6n dQng voi t6c d0 v = 0,8 c ld 4.12 cm. B. 18 cm. C.3 cm. D. 6 cm. . giu 44: MQt vdt cO kh6i luqng 0,5 kg thuc hi€n ddng thoi hai dao dQng didu hda ctrng phuong c6 c6c phuong tinh dao dQng ld xr =6cos(l0t)(cm), xz =6cos(101+2rl3xcm). Cia tri csc dai cua hgp ' lUc tic dtng l6n vQr ld A.30N. 8.3N. ' C. l2N. D. 15N. CAu 45: Dd chu ki con lic don Gng th€m 5% thi nhai tang chiAu ddi n6 th€m A. 10,25yo. B. 5,75yo. C.2,25yo. D.25%. CAU 46: Tucmg tdc gitra cdc hadron ggi ld A. tuong trlc manh. B. tuong t6c yr5u. C. tuong tdc diQn tu. D. tuong t6c h6p dAn. . Ciu 47: Cho m4ch R, L, C theo tht tg mfc nOi ti6p voi nhau. Di-en 6p cira mpch uAB = 200.,D cos I 00?rt (V) . C6c diQn 6p Unr vi Uq c6 cung gi6 tri hiQu dung nhrmg lQch pha nhau mgt g6c 2n /3. Gid tri higu d$ng cria c6c diQn 6p d6 ld A. 100 v. B. 300 v. c.200 v. D.400 v. Cdu 48: Bii5n digu s6ng diQn tu ld A. ldm cho bi€n d9 s6ng diQn tu tdng l€n. B. t6ch s6ng diQn tir arn tAn ra lch6i s6ng dign tr: cao tin. C. bii5n e6i s6ng co thinh s6ng diQn tu. D. tr6n s6ng diQn th em ten voi s6ng mang. Ciu 49: MQt m4ch dao dQng g6m cuQn cim c6 r=0,5f1, L =210FlI n6i ti6p voi fiJ C = 420 pF. H6i phii cung cdp cho m4ch mQt cdng suit ld bao nhi€u de duy ti dao dQng cta n6 voi diQn 6p cgc d4i tr€n tr.r le6v? A. l8pW. 8.0,36mW. C.0,2i5mW. D.430pW. CAu 50: MQt ch6t ph6ng p c6 chu kj,b6n re la 360 gid. Khi l6y ra sfr dung thi th6i luqng chi cdn l/32 kh6i luong lrc -,a ni,anlA. nnr e#t"i1" moi&f; ae" r,iJ J&;8" * - A. 75 ngdy. B. 100 ngdy. C. 80 ngiy. D. 50 ngdy. Trang 5/5 - Me da thi 209 rRrJoNCr'rprEAoDUyrLr f{UsNG nAru crAg pp rHg rrrqf FSI F{sc rAN v (s312tlla) naonq: vag nt rvgA pE: lee Cdu I . Khi c6 c6ng hu6ng thi hQ s6 cdng su6t; cucrng d6 ddng di6n hiCu dgng; hiQu di6n rh6 hi6u dung rr6n di6n trd dcy dat cgc d4i ndn c6c ph6t bidu A, B, D atrng. NeJtang tAn ro ir.,i"i gia., 2. $am ) Us giim -+ plrrlt bi6u C sai -+ chgn C. CAu 2. Vi thuc t6, trong quri trinh truyen s6ng, ndng lugng bi ti0u hao n€n bi€rr F0 giArri A dirng. S6ng ccr truy€n ducr. c trong mdi truong ld do Ju bii4n"dang'cria m6i trumt ao. ro" o-?iiryAn ffiirng li t6c dd lan truyAn bii5n dang cria m6i trubg -'C dring. Chi c6 s6ng doc m6i truydn dugc trong idng cl#t l6ng vd khdng khf, b6i trong ch6t l6ng cfrng nhu rrong kh6ng khi chi c6 bit5n dang ndn, ddn, kh-6ng co ui6n'aang lOch *-B ching; D sai * chgn D CAu 3. Vi B c6 dinh, M li biing thri tu n6n BM : 3.+*4=r4cm* A=Bcm-* sr5 bung n: 1/l AB l =6-chqnD' t (ch[ y: cdn c6 truong ho.p M ld bung thri tu tinh t& A, nhrmg trubng hgp nAy kh6ng th6a mdn). .r, )*;1*i* CAu 5. Goi di6m x6t ldN, ta c6 up: acos f*t-2"4)=cos(*t-4l.Litct:T12, uN:5cm +a: T A' 'T 3' IOcm- chon C Cf;u6.Bu6cs6ng ),:vlf=0,4cm.C6 i/=S'ft =41 (nguy6n).Vi Sr,52kh6ngph6i lddi6mdaod6ngv6i 2 bi6n d6 cuc d4i, non s5 di€m dao d6ng cuc dai tr6n 51, s2 la N - 2 : 4r - 2= 39. chgn D. C0u 7. Phuoxg trinh s6ng tai m6t diiim cd toa dd x ld u : 2cos(4tfr. - zr:yA,"). ,-+ 2tcxh,: 0,02rvx o l.: 1 00cm -* chQn A CAu 8.VAt dao ddng <iiAu hda theo truc c5 Oinn c6: li dd cria vAt biOn rhi6n diAu hda, d6 thl toa dO ln hinh sin, con qu! clao ld ciopn thdng + chon C. Cdu 9. Ap dung dinh ludt b6o todn ndng luong ta co ! LI^' = lqo,t -+ I^ - $: rchon B " 2' 2C -u JLC CAU i0. Ta c6 gi6n dd Fre-nen nbu Hinlr I T\. +). U ,,. IJ,. -U , I ".,5 lu gran do i sinrp : -; = -i- =,- cosg = ::- + chon A CAu tr1. Trong rn4ch dao ddng tu do LC, ndng luong di0n trucrng tap trung 0 tu di6n, ndng luqng tir tr.ucnrg t4p trung & cuQn cfun, chring c6 cirng giStr.i cuc dai, lu6n c6 sy chuyiSn h6a qua. nhau nhrmg t6ng kh6ng 5$; ' phrit bi6u A, B, D dirng. Nang h:qng diOn hudng vd ndng tugng irl trucng ti6n d6i tuan hodn rheo thoi giarr v6i rArr sO ./ = -:. + ph6t bi6u C sai + chon C. nJ tc cau tr2. Bitin di6u s6ng diOn tri c6 t6c dung trQn s6rrg di€ri tir 6m dn voi s6ng mang + chgn c. Ciu 13. Thuy6t di€n tri ll46c-xoen dA c$p d6n rnOi quan h6 gi&a di6n trulng vd. rri trudng* chpl D. CSu 14. Tir I = 2nntIc ,L ! LI^' =L Qo,' -) T = Zrr& - chon C. 2 " 2 C lo. CAu 15. Chon C, vi rnu6n c6 ddng di6n xoay chi6u rhi t& th6ng qua rn6t mach kin phAi biOn thi6n tuArr hoAn. Cric di0u ki€n 6 A,B vd D Id chua dfr. ,.P Cdu 17. Khi duy tri du-o.c dao tl6ngcira mach thi. W =! Uo' =lCUo' -> I3 2"2 CAn phAi cung c6p cho mach m6t c6ng su6t P = I'r = !, =181.nu_*chgn B. 2 CAu n8: t:0,06 s; i:0,5 A + 0,5: I6.cos(100n.0,06 -n/4) +Io= 9A * I:0,5 A * chon A. 2 CduXg: Ir:IJi=2Ji,q;m?chchiraRCn$ng= -nl6;gi:Qu- <p=nl4-(-7y6)-*5n/12 *chQnA. C6u tr6. Ginn dd Fre-nen nhu Hinh 2. C6 MO : MN; g6c (OMN) : 60" (vi g6c (MoP) = 120") + tam gi6c OMN dOu Unr-: Uc: U = 200 V > ChOn B. C6u 26. Tt hO thric Anhxtanh ta suy ra Hinh 2 =c'uto L 44 = 0,22lnt - Cdu 20. CiAn d6 Fre- nen nhuHinh 3. cosq : 0,8 ' sirrg : 0,6 cosq: Un/U -+' Un:240 V sin<p: (tJL-Uc)/U + Ur : U.sinrp + U6 = 329y. r : = U*. = VU,i +U; :400 V ) chen D. UR Hinh 3 Ciu 21. Cdng su6t d4t max n€n R : lZ,. - Z,,l ; R: 50O; Zc: 10 f) -+ Zr: 60 O. -+ chon C Ciu 22.Vi m4ch chi c6 tp n6n vcri u = UgcoSot i : Iesinrr;t *4 ++ =l - chen B U6 16 CAu 23. Ei0u kiQn cl€ x6y ra hiQn tugng quang diQn ld bu6c s6ng cria bric x4 chitiu vdo kim loai ph6i nh6 hon ho{c bing gi6i han quang di€n (bu6c s6ng dAi ntrAt ee gdy ra hi€n tugng quang di6n)-* chgn A. Cdu24. Zy:200Q;Zc:100 f)*Uorc=200V. Zu>Zcn6nrpLs:e;+nlT:-nl3+rl2:nl6 +chenC. Cdu 25. Cdc phfit bi6u A, C, D d€u ct0ng (SGK co bdn trang I 39;140;141). C6 l"h6ngng6ai ) Xtrngoa + fi,6ngngoa < fnrngoai+ ph6t bi6u B sai + chqn B. hc hc r :i t ;2 )" t,_( ,1_{ v l hc hc Iu'J \r^[i ) \/\/ ./L Ao 1 =t'no 22, - )"1 chgn D. Ciu 27. Quarrg phO h6p thu cfrng ld quang ph6 vacli nhrmg vach phd sring khi ph6t x4 tr& thenh vach ttii trong quang phO nap thg. Hi6n tugng d6 dugc ggi li su ddo vach quang ph6 -* chon C. C6u 28. Quang,ph6 vach hdp thu ld c6c vach.hayd6m v4ch t6i tr€n nAn cfra mdt quang ptr6 lien tuc. Do d6 d6 co quang ptrO trdp thu thi nhi€t d6 cfia ngu6n h6p thp phii b6 hon nhiQt dQ cria ngudn s6ng tr6ng chen B. Cdu 29. Vi trf vAn tt5i tren mAn giao thoa: x=(2k+1)il2=(2k+lfiDl2a=(2k+l)112=3 0,41 <A= 6 -<0,65 * k:5; k:6. C6 hai 2k +1 . a. buc xa co vAn t6i tai di€m xdt + chon A. Cau jO. Tia X c6 bu6c s6ng ngin nh5.t img v6i truong hgp todn b0 dQng ndng cria €lectrdn chuy€n thdnh ndng lucr. ng cta photon cira birc x4: hf,* = eU Itf ^ eU U t"' + / 'ru = "- =-i_ =0.8='i-= 0^8-+ l,i,;n-_ 0,8.50=40rrm-chgnA. hf ,:,^" cl.J' 1,25.U l,ni, 2. CAu 31. i =)"D/a: 0,54 mm. 35 van sdng quan sdt duo.ciren md.n t',t =rl !)+t : 37 - chen A. Lli_l CAu 32. C6c ph6t bi6u B,C,D dring (SGK vat li I 2 trang 161 ,168,169). Nang lucrng cta nguy6n tu g6m d6ng ndng cfia cdc €lectron vd thO ning tucrng t6c gita c6c 6lectron vd hat nhAn +A sai * chon A. Ciu33. Tir he thfc Anh-xtanh ta suy ra: hc hc 3LJ.', : 0,25 ) Ao - ^fr= 0,45 W -> chqn B C6u 40. m: m()132 t_ = 32 -+ = = 5 -+ t = 5T = 1800ft = 75 ngdy -+chqn B. T C6u 4X. Ap dung dinh lu6t b6o toAn d6ng Iucrng P = Pr + P, (Hinh 7) Vl Pr : F2; g6c( F, F, ) =600- tam gi6c OPPr ddu-* F1 : P2 = P + ITl.V yt = L- cholt B. lx* C6u 42: Ta c6: H6: 2No= 9"" -+ No : 4.51.10r8 hqt *r m6 : img + chqn B TU /u\' -l_l - \,2v ) r '1 lv\ _tt - f,7l 1o hc ), ; nc X' )"0 Ciu 34. GiAn dd Fre-nen nhu Hinh 4. ' Vi Ar:Az ; g: (4,,1r):2n13 * ram gidc OAA1 ddu + A : At:6 cm. Frnu : mO2A = 3 N + chon A. o C6u 35. Theo bdi ra W6 :W1 * Wo :Wt :W/2 :W 5^ol2-+ v : vn^*l J2: l0.,ll cntls. + chqn C. CAu 36. Tai thoi di6m t = 0, mtt cta vdc to quay 1 dangbM, .q LW v6i ({) g6c nl4 (Hinh s) + pha ban dAu cria dao dQng q : -nl4 -> chon B. CAu 37. Tdc d0 trung binh cria ch6t di6m trong I chu kj' : 4AlT: 50cr.n/s -+ chQn B. Cdu 38. L[c t = 0, v6c to quuy tr 6 C. (Hinh 6). Khi v6t qua vi tri c6 li dO 5 cm lAn thri'nh6t theo chi6u duong, v6c to quay tr 6 M vd dA qudt duoc g6c q: 5nl3(Hinh 6 ). Mat khdc c6 ,p = ?t t: 5T16-> Chon D. T CAU 39. Tucrng tric gita c5c hadron goi tucrng tzic manh (SGK v{t lf i2 co bAn). -> Clron D. Hinh 4 ! -+ 2T ph6t huy trong pharn vi kfch thu6'c hat nhAn. rang 200; 20D. B6t cir mOt ph6n rmg t6a ndng hiQt h4ch ld sg k€t hqp hai hat nh6n nhg thdnh ;6n nhi€t dQ hdng trdm tri€u d$ * phSt bi6u C t3,6t4 625 625 13,6 19 256 256 CAu 43. Lgc hat nhdn lu6n lu6n ld mQt lr;c lrrit manh vd chi pf -cheu B. Cfrw 44. Cdc ph6t bi6u A, B, D diing (SGK v6t li 12 co bAn tran lugng ndo dAu ldm n6ng rn6i trudrrg xung quanh. Phin rmg nhi€ ni6t hat nhAn ndng hon. D€ c6 duoc pharr irng nhi6t hach rhi cAn sai - chon C. CAuI "{5 E4 - E: : hc/la -1 Es-E.,=hc/). l- ^ -E*-Et -_ 13'6/16+13' t )"0 Er-8. -13,6125+13, Hinh 5 Hirrlr 7 Cdu 46. 1 +2- = l.0939pnt- chQn D 11 A -4, fr ^l C6u 47. T' =T + 0,05f :1,057 -+ ./ . = 1,05 -+ l' =1.10251 -+ "" - 0.1025 = 10,25% -+ chQn A ' lJ l '' t :) CAu 48. Ta c6: \. \ = 42 = corlst +khi gid rri vAn t6c tdngthi dQ lon giat6c cia vdt fiAm - chon C CD' O- C6u 49. Trong hi6n tuorg cdng hu0ng, hhi lr,rc ma s6t cdng bd th) bi6n d0 dao dQng cdng lon (cQng hucrng nhgn); (tham khio Sg| v{t li 12 co bin trang 20). Ciu 50. Khi vAt chuy6n d6ng vo'i vdn t6c "-fp "iv6n ttic 6nh s6ng (v = 0,8 c) thi chiAu ddi cria vAt thay d6i l2 theo quy luat: L: f-r./f -! =30.0,6 = lB cm dQ co chi6u dai Al: 14-L= l2 cm * chqn D !c' oAP AN CAc MA oC THI THO LAN V MON V :t Li 12010 - 20',11 . cAn sai - chon C. CAuI "{5 E4 - E: : hc/la -1 Es-E.,=hc/). l- ^ -E*-Et -_ 13'6/16+13' t )"0 Er-8. -1 3,6125+13, Hinh 5 Hirrlr 7 Cdu 46. 1 + 2- = l.0939pnt- chQn. lqo,t -+ I^ - $: rchon B " 2' 2C -u JLC CAU i0. Ta c6 gi6n dd Fre-nen nbu Hinlr I T. +). U ,,. IJ,. -U , I ".,5 lu gran do i sinrp : -; = -i- = ,- cosg. 0,5: I6.cos(100n.0,06 -n/4) +Io= 9A * I:0,5 A * chon A. 2 CduXg: Ir:IJi=2Ji,q;m?chchiraRCn$ng= -nl6;gi:Qu- <p=nl 4-( -7 y6 )-* 5n/12 *chQnA. C6u tr6. Ginn dd Fre-nen nhu Hinh 2. C6 MO