D+r HgC QriOC GLA HA NQr TRTIONG TIIPT CHT|YEN IGITN oB rrNtvr TRA KIEN TIITIC THI DAI rroc i.iAiw aOLI _ LAN 3 Ciu l: Cdu niro du6i dAy ld dirng khi noi uC -Oi li6n h0 giira n[ng lugng di6n trucrng W61 vd nbng lucrng tir truong W1, trong mach dao dQng LC li tucrng c6 dao dOng diQn tri tu do vdi chu ki dao dQng T vd ndng lugng di6n tir W : I 4 (1rdt gi|tri cuc dai dign iich cua tu di6n). ' 2C A. Wat, Wtt bi6n thi6n diOuhda theo,thdi gian v6i cung chu ki T, cirng bi€n d0 W vd ciurg pha . B. Wa,, Ws bi€n thi€n diAu hda theo,thbi gian vdi ciing chu ki 2T, cirng bi€n d0 2W vd ngucrc pha TW C. Wot, W6 biOn thi€n diAu hoa theo thoi gian v6i cirng chu ki :, cung bi€n dQ* ua nguoc pha 2' 2 D. Wat, Wrt bi6n thiOn diOu hda theo thdi gian vdi cing chu ki T, cirng bi6n dQ 2W vd cirng pha CAU 2: Dirng mdt mach dao dQng T,qH tuffng lam dng ten thu thi n6 thu c6ng htrong dr,rgc m6t song di6n tir c6 buoc s6ng 1.1 :300m. NOu mic thOm mQt tp diQn Cz n6i ti€p tu.li6n Cr thi mach dao dOng LCrCz thu c6ng hu6ng duo. c m6t s6ng diQn tu c6 budc s6ng l, :240m. Ndu chi dr)rng tu diQn Cz thi rnach dao ddng LC2 thu cdng huong clugc mQt s6ng diQn tir c6 budc song ld: A.400m 8.500m C.600m D.700m Cflu 3: DO tao ra tia X ngudi ta dirng 6ng Cu-tit-gio. Kht ddt mdt hi6u cli6n th6 vdo andt vdr catdt ctra 6ng Cu-lit-gio thi culng dQ ddng diqn chey qua 5ng ndy I : 40mA vi t6c d6 cira dlectron khi t6i an6t la v: 8.107m/s. Bd qua t6c dQ ban dAu cira Olectron khi bat ra kh6i cat6t. Cho di6n tich vd khdi luong cira dlectron e : -1,6.i0-lec, m:9,1.10-3lKg. Cdng su6t trung binh cira 6ng Cu-lit-gio ld: A. 728W 8.730W Cf,u 4: Hinh bdn bi6u diOn sU phg thu6c ^ .A vAn tdc dao d6ng cfra m6t vAt dao ddng di€u hda theo thoi gian t. Phuong trinh cta dao cl6ng di€u hda ciia v6t ld: 7[ A. x:4cos(5rt- l)cm '6 7r C. x:4cos(10rt- ^ )cm 3 duoc c6 bu6c s6ng li: A.800m 1t B.x:4cos(5nt+ - ) cm 6 D. x:4cos(lOnt * L\" a' J 2.078 10?E c.732W u{cmrtsJ 1 3S D.734W 13 30 Ciu 5: Dao dOng ri6ng cira rnach dao dQng LC li tucrng c6 tinh chAt: cir sau mOt khoing thoi gian t : 10-6s thi ndng luqng diOn trucrng lai bing ndng luong ttr truong. Dirng mach dao ddng ndy d€ thu cQng huo'ng mdt song diQn tir. Bi0t tOc c10 truy€n s6ng diQn tu trong kh6ng khi c : 3. 10t m/s. S6ng di6n tu thu C. i200m Mbn thi: VQt t!, (50 cdu rriic nghi€m) Tltdi gian ldm bdi: 90 phrit B. 1000m D. 1400m ciu 6: V4r t6c vd gia t6c cira con i6c 1o xo dao clQng di0u hoii tai c6c thoi di6m tr , t2 Qo gi6 tri trrong ung ld v1 : 0,l2rnls, urJ 0,64^ls2,v2:0,16m/s, a2:0,48m/s2. BiC' dQ vat6n sd g6c dao d6ng cua con lic 1a: A. A:5cm, o:4radls\p. A:3cm, co:6rad/s C. A:4cm, {D:5rad/s D' A:6cm, crl:3rad/s 7[ Cf,u 7: Mqt chAt di6m das dQng di6u hoa tudn theo qui ludt: x: 5cos(5nt -; I t"-1. Trong khodng thoi J gian t :2,75T (T.ld chu ki dao dqng) cnat eicm di qua vi tri c6n bing cua n6: A. 3 lAn B' 41an ,. C' 5 lAn D' 6ldn ciu g: Dung mot mach dao dQng I,-c li tuong ec trru cQrrg hucrng cfc s6ng dien tri,.Jlonq do cuQn diy co d6 tu c6m L khong ffi aoi, rotitu diQn c6 iigtr aung c thay d6i duqc. ti,{5i.s6ng diQ'tit dou tao lu ltSng mach clao aO"g ,roir"ir aie*aOrg c6m ulB. Xem ring^c6c s6ng di6n tir c6 bi6n dQ cam rmg tir deu bdng nhau. Khi di€n dung cira t9 dion cr : 2.10-6-F thi su6t dien dong,cam irng.hiQu dpng trong m4ch do s6ng diQn tu t4o ra ldr Er : 4pV. Khi diQn dung cua tg diQn C2 : 8.10-6 F thi suAt diQn dong cAm img hiQu dqng clo song diqn ttr tao ra ld: A. 0.5Pv .8. tl'Y , c'.1',? tY D' 2 Pv Cflu 9: M6t con lic ld xo treo thdng.dimg gdm mQt qui cAu co kh6i lucrng.m:0,15kg vd ld xo c6 dQ ctmg k - 60NA'. Nguoi;;;;; q"a.I" ie" "ilri a6 rd xo kh6ng bibien oang iol truy6n cho no mQt v0n tdc ban , ^6 1 ' 1 a o ,n- iA^ ^^- I*^ .lo^ , ddu vo mts theo phucrng thing dimg l€n phia trdn. Sau khi dugc truy6n vAn t6c con lic dao dQng di6u ) hoa. L6y fu. ,r,oi gian t = 0 ld hic qu6 cdu dugc truydn vfln t6c, g: 10m/s2. Thdi gian ngin nh6t tinh tt thdi di6m t : 0 d6 luc ddn hOi tac dgng 10n qul cdu c6 dO lon bing dO lcrn cua h,rc ddn h6i ctrc dai lir : A. -s 5 7t B s 10 7T C s 15 ? a J S t; r/J D. a J ^12 a J "h A._ 2 ,/L D 20 Ciu t0: Vcri dong diQn xoay chiAu 3 pha mic theo ki6u hinh ,uo, ,,6u ba tii ti6u thp hodn todn gi6ng nhau thi cucrng c16 dong diQn ch4y trong dAy trung hoa lh: A. Bing.h6ng B. Kh6c khdng C. Chi bang COirg dmQt sO thOi ei6m D. Ciba phucrng 6n A, B, C ddu sai .!,, _., Cfiu 11: MQt xe mdy ch4y tren mQt con dubng gd ghA, cri 10m tren duong xe lai gap *9t *9 d?t nh6. Bi6t . chr-i ki dao dQng ri6ng cua khung xe tr6n c6c lo xo giim Xoc To :2s. Xe biXoc manh nhAt khi vin t6c ctra n6 ld: A. 5m/s B.J,Smls C. 10m/s D'12,5m/S Cf,u 12: MQt m4ch dao dQng LC li tu0ng co diQn dung C : 2 yF vir ndng luqng diOn til W : 16.10-6 J. Khi hiQu dien the giira hai bin cgc cua t[ diQn u: 2V thi tj' s0 giira cucmg dQ dong diqn i chay trong mach vd cucrng d0 dbng diQn circ dai Io ld: t; !J B. "- c. 2 Cffu 13 : E4t m6t hiqu dign th6 xoay chiAu u:200cos100zt (V) vio hai dAu ctra mQt m4ch diQn g6m 1_ R, L, C mic n6i ti6p, trong d6 cu6n dAy li tu&ng c6 dQ tu cdm L: :H, tu diQn co diOn dung C bi€n dOi. 10t i ! 1 r .r -1- li 7T Khi C = F thi dong diQn tirc thdi ch4y trong mach nhanh pha m6t goc ld t to voi hi€u diQn th6 tuc 3n uvrrb erYrr 6 thoi giiLa hai ddu doan mach. D0 c6ng suAt ti6u thu cua doan mach co gi6 tr1 bang rnot nira gi6 tri cong su6t cuc d4i thi diqn dung C cira tp diQn co gi6 tri ld: A. 7,134 pF B. 14,268 pF C'21,4021t"F D' 3i,847pF r,r: ,+A +Li (?Q C6u t4: M6t ri6ng co kh6ng d6ng bQ ba pha mhc vito Tq.h dien 3 pha, trong d6 di6n 6p pha co gia tri hieti ci,.rr.ig U :220y Bi6; #. ;;;il;AJ "tt" 9O"q1o ndybing 0,85 vd cuons ci6 hiq' ciung cira do'g di€n -"rv Jre, .huy quu m6i cuQn day bang l0A. COng suAt di€n cua dQng co lir: " J a. t,gZt W. "t 3:7-4yY - C' 5,61kW . D' 7'48kW - ^L.i+.o hoi riqn rtA Ciu 15: Hai ngu6n phdt.song k6t hqp Sr, Sz t{n mg ctr:At lOng c6ch nhau 3Ocm ph6t ra hai dao dQng di6' hda cing phuong, cung ten ,o. f : 50Hz vd piu uutr ddu bing thottg- Bict toc dQtr'ydn song tren m4t chdt long v: dm/s. Nhtu;?,c"r rra*,ren arr;;i*"g try.c"cua do?n SrSz mir s6ng tolg h-on t4196 luon dao d6ng nguoc pha vcri ffi,6ng hnp ;ui o to"ra tring di6m cua srsz), c6ch o m6t kho6'g nhd nhat c6 vi tri ld: 'A.+:J6"- B-r4G.* C'+5J6t* D'+6G"- ciu 16: MQt sqi oav nra"r-, a*-noi, '6, ax, cang ngang c6 dau A dao dQng dieu hoir theo phr-rong thing dirrig voi tAn s6 f thay doi duoc trong khoin gtu 45Hz d6,n10Hz. song tao thdnh lan trtryAn tron day voi van to. u : 5m/s. D6 di€m M tren ddy c6ch dAu A mQt khodng bing 20cm lu6n dao dQng ngtrgc pha v6i A rhi tAn s6 f c6 gi6 tr! ld: A.48,5H2 B.56Hz C' 62,5H2 D' 68Hz Cf,u 17: Mdt con fi" fO xo gtm v4t n{ng co kh6i lugng m : 0,2 kg vd lo xo co dQ cung k = 80 N/rn dao d6ng cri€u hoa theo phuong .rim ngang . Ldy glcthoi gian t : 0 rd lirc vat nflng co vdn tdc v6: 0,2mls vi gia t6c as = + Jj mls2 . phuong trinh dao dQng cua con lic lo xo ld : 7t A.x:2cos(20t+ -)cm 6' 5tt C. x : 2cos(20t.u -) srn 6' Cf,u 18: Dat mQt ngudn 'iin xoay chidu co hiOu di€n tilC higu dung U " 120V, tdn s6 f vdo hai dAu A,B ctra mach di6n lrhu hinh v6, trong c16 R = 30Q, cu6n ddy kh6ng li tuong c5 diQn tro thuAn r: 10f) va dQ tu cirm L, C le tU diQn. Biet hieu diQn th6 tuc thdi giira hai didm A, N lQch pha mot goc lir so voi hiQu dien th6 tirc thoi giira irai di€m M, B, d6ng thoi cubng d0 ddng diQn tirc thoi ch4y trong mach chdm pha mQt g6c ld liiqu dign th€ tirc thdi gita hai ddu A,B. C6ng suAt ti6u thq cua mach diQn ld: A. 12oW B. 14oW c. 16ow \' isow cfiu 19: Trung di€m o cua mQt sqi ddy ddn diQn AB (A, e co ainh) chiOu dai/ dat trongmQt.tt tnrcrng d€u sao cho c6c ducrng sirc tir trudng vuong go. uoi sqi day. Cho mQt dong diQn xoay chiAu gt S: l: t^6U1 - chay rrong sqi day d5n thi tran idy nay hinh thanh song dimg gom c6 8 bung song. Bi6t tdc dQ truyen s6ng tr0n day d?,l'v: imls.ChiOu dai cua sqi ddy d6n li: A. 30cm B.40cm C' 50cm D' 60cm Cf,u 20: Trong thi nghiQm Y ung uA giu" thoa 6nh s6ng: D = ^2\,r1ar $reiuy: fi:l lhq O:t:lidon sic c6 btroc song ), = O,izpm.Biet khoang c6ch gifta vdn sang bac 4 vi vdn toi thf 3 (k0 tit van s6ng trung tdm) o khdc phia so voi van sdng trung tim ld 6,24mm. Khoing cdch a giira hai khe Y-dng ld : A.0,5mm B. lmm C' 1,5mm D' 2mm Cf,u 2t: Dat mQt hiQu diqn th6 xoay chidu u: 100J2 cbs100\t (V) u:?,hui.d.uu cira mpch diQn gdm R, I-' C ;;;6iiieb, ,r"rg a6 cu6n d6y li tu&ng co dQ t1r cim thay ddi dusc. Di0u chinh dQ tg cam cita cuon ddv thi . 0-3 0,9 \ +^ r .^ r, 1 rr.^- r:A^ .,^^,, ^r-:A,, ^1.o., trnnc mqnl' th6y khi Lt: LH vir Lz : u" H, cuirng d0 higu dgng cuir dong diQn xoay chidu chay trong mach d€u 7t 7r bing 24. Dien trcy R vi diQn dung c cia tu diQn c6 gi6 tri ll: t B.x:2cos(20t ;)cm '6 5n D.x:2cos(20t- - )cm '6 L.rRtJB , i r"$:,i:ti'-*La-*: |-/ -1 1I \- r, ,/L 1 /L 4 so vo'i Trens ill 'lrir? ae tni S:t 10-' i 0-' A.40O F 8.30O F ' 6tr 3n lr dong di0n trlc thoi chay trong mach i : Iecos(cot + ; ) (A) b H6p den X co th€ chira t ho{c 2 trong 3 ph6n tft R, L, C ndro sau diy: (cuOn dAy li tucrng c6 dQ tp cAm L) r\ l nn 1o-' E l_r, J v\ 4, r 6tr L, t-{nTB-{mr'-1r-]= ^{ D.C 10' ( O(ll2 -l -t7T Ciu 22: Ctrong dQ dong diQn tirc thdi cua ddng diQn xoay chiOu chay qua mQt diqn trd R tudn theo qui ludt i : 6.28sin I 00ft1 (A). Di6n lugng chay qua diOn trcr niry trong thoi gian 5 phirt ld: A. 600c B. 1200C c. 1800c D.2400C Ciu 23: MQt mfii nhgn S tr6n mdt chAt long ph6t dao dQng di€u hoir u : Acos2O n t (cm). Bi6t v6.n t6c ).,J truyen song nam uong khoang tu Z}crn/s d€n 25crn/s. Ee hai di6m M, N tr€n mdt chAt long nim tr6n cing m6t phuong truydn song di qua S c6ch nhau 6qm lu6n dao d6ng nguoc pha nhau thi vQn tdc truyAn s6ng ld: A.20cm/s B.23cm/s C.24cmls D.25cmls Cffu 24: Trong thi nghiOm Y-dng vO giao thoa anh s6\g: a: 0,5mm, D : 1,5m. Hai khe duoc ciri6u bing clrilrrr buc xa g6rn c6 budc s6ng Ir: 0,63'pm vd)"2. Trdn dQ r6ng vung giao thoa l.: 18,9 mm cita mdn giao tlroa ta th6'y cb 23 vdns6ng, trong d,6 co 3 vAn s6ng tring nhau ctra hai hQ vdn giao thoa c0a Ir, f,z . ni6t ring hai trong ba vdn s6ng trung nhau do nim ngodi cirng. Budc s6ng 7'2 lir: A.0,45pm . B. 0,55prm C. 0,65prm D. 0,75pm Ciu 25: Ddt ldn luqt mQt ngu6n dipn mQt chi6u c6 hiQu diQn th6 Ur = 110V vd ngu6n di6n xoay chi€u c6 hi€r-r di€n UrC nieu dung U2I U, , t6n sd f : 50Hz vdo hai d6u cua doan mach gdm rn6t diOn troR toic n6i ti6p voi m6t cu6n diy c6 diQn tro thuin r:2Q vd dQ tg cdm L. Khi d6 cuong dd dong diQn vd cuong dQ hi€tr dtrng cira dong diQn xoay chi6u c6 gi|tri tucrng rmg ld :\:2,75A,12:2,2 A. Gi6 tri cira R, L lir: 0.3 0.6 A.R=38O,L= H B.R:3OO,L- , H c.R:4oo,r: 9f H D.R=5oo,L :''2, 7T 7t 7t 7T Ciu 26: Eoan m4ch AB g6m m6t cuQn ddy li tudng c6 dO tu cirm Ls mic nOi tiep voi mdt hdp den X. DAt vdro hai dAu A,B cira doan m4ch ndy mQt hiqu dign th6 xoay chi6u u = Uscos(ot - ) (V) thi cuo'ng d6 7r 6 A.L B.RvdL C.RvdC Ciu 27: Chon cdu sai: khi truydn tir khdng khi vdo nu6c thi: A. Buoc s6ng ctra s6ng dm gi6m con buoc song cria 6nh s6ng tdng B. TAn sd vd chu ki cua s6ng Am vh inh s6ng dAu kh6ng tnay AOI- C. Nang lugng cfia cA s6ng 6m vd 6nh s6ng dAu bi giAm D. Song Am vd 6nh s6ng dAu bi phAn xa tai mflt ngdn c6ch giira kh6ng lchi vd nu6c Cfiu 28: Trong thi nghiOm Y-dng vi: giao thoa 6nh s6ng vdi 6nh s6ng tring c6 budc s6ng tir 0,38pm c16n 0,76pm: a: 0,8mm, D :2m. Tai vitri vdn s6ng bdc 4 cira bu6c s6ng l,: 0,64pm cdn c6 bao nhi6u bric xa khdc cirng cho vAn s6ng tai do: 4,.2 B. 3 C.4 \D. 5 Cdu 292 Hai ngudn ph6t song ket hqp Sr, Sz tr€n mdt ch6t l6ng c6ch nhau 2lcm phdt ra hai dao dQng di6u hoi cirng phtrong thing d.ntg, cung tdn sO g6c co : 30 r rad,ls vd nguoc pha nhau. Tr6n mdt chdt l6ng xiy ra sr-r giao thoa cua hai song. Bi6t t6c dQ truy6n s6ng tr€n mat ch6t long v : 90cm/s. Sd ducrng cuc ti€u giao thoa trong kho6ng SrSz li: A.5 8.6 c.1 D.8 Ciu 30: Chi6u mQt chirm s6ng hep gdm mdu tim vir miru do song song v6i truc chinh cua m6t thAu kinh h6i tLr. Kiri truyAn qua thAu kinh chum s6ng bi t6.n sic vd hOi tu tai hai ti€u diOm nim tr6n truc chinh cira th6u l<inlr. Bi0t chi6t suAt cira thAu kinh dOi voi 6nh sdng tim vd do tuong rmg: n1 :7,64, il6: 1,6, chi€t suAt "tu khdng khi bing 1, ti€u cu cua thAu kinh aOi vOi 6nh s6ng tim ft :28,125cm. Ti6r,r cu cua thAu icinh d6i v<tr 6rth s6ng do ld: A. 20cm B' 25cm C' 30cm D' 35cm cflu 31: Dao d6ng diQn tir trong mach dao dQng LC li tuong khi cho tp dien tich dien rdi cho n6 phong diQn id: A. Dao d.ng diqn tir cuong bric B. Dao dOng diqn tir tit dAn D. Dao dQng diqn tir tg do c' Dao d0ng diQn tir duy tri r h6 quang cliQn voi cac dign cuc bing sat le, Cfiu 32: Chon cAu dunf: quang ph6 cta 6nh s6ng ph6t ra'tit A. Quang pno iien tu" B' Quang ph6 v4ch phdt xa C. Quang ph6 v4ch hdp thq D1 a;""g Pl: ll* *" u-lQtlut^e phO v4ch hAp thp Cffu 33: Dat m.t "g"r["!ie" *ouy "f,iO,, "O [16.iqie"'-n:^ltrt d\rng U ua tAniO f vio hai dAu cua doan m4ch g6m R, L, c mrc "6iltd, i;;r,e do .rd;;ii;"6d n6t ;;l ;il;pdie. n v6i mQt ampe r<c tni th6v no chi 1A, dding thdi dong diQn tirc thdi ch4y qua ampe k6 ch6m pha mQt e6" 2 so v6i hiqu dign the tirc tho'i gifia hai dau doan m4ch. Ni5u thay ampe t<c bing m6t v6n t<c ttri th6y no chi 167,3v, dd'g thoi hiQu diqn thc tfc tlroi giira hai dau v6n k6 ch4m pha mQt goc I ,ov'i hiQu diqn thd tirc thoi giira hai dau doa'mach' 4 Bi6t rang ampe kri vd vdn te ACu li tucrng. HiQu diqn thi hleu dung cta ttgttdtt di6n xoay chi6u ld : A.100v B.l25V c' 150v D' 175V Ciu 34: MQt may phit diQn xoay chiAu mQt pha co tAn sO goc a: :\\nradls vd t6c dO quay cira r6to n: 720 vong/phfit. 56 cflp cuc cta r6to lir: L.4 B. 5 c' 6 D'7 cffu 35: chon cau dung: dong diQn chay trong m4ch dao dQng LC li tu6'ng ld.dong ciiQn kin trong do phan clong diQn chaY qua tP diQn img vcri: A. Dons chuv6n ddi co hucrng cira c6c Olectron B. Ddni chuyen ddi co hu6ng cliuacSc ion duong C. Dong chuySn ddi c6 hu6ng cita c6c ion Am D. SU UIen tniOn cua diQn trucrng trong t.u diQn theo thoi gian Cf,u 36:Tinh ch6t ndi bflt nhAt cua tia hdng ngoai lh: A.C6 kha ndng gdy ra mQt sd phAn img h6a hqc, B. C6 tn6 bitin diQu dugc nhu s6ng diQn tit cao tin C. C6 t6c dqng nhiQt r6t mAnh D. Cfr'g tu6n theo dinh luQt: truyAn thdng, phin xa, khitc x4, nhi6u xa vd: giao thoa nhu 5nh s6ng thOng tlrtrcnrg cffu 37: M6t con lac dcrn chieu ddi / thlrc hiQn dugc 6 dao dQng trong thoi gian t. N6u tdng chiAu ddi cua ddy mQt doan A t!, :3acm thi trong thoi gian t tr€n n6 thlrc hiQn duoc 4 dao dQng' chiAu cldi '/ ctra con lic li: A.24cm B.36cm C' 48cm D' 60cm ciu 38: D4t mOt ngudn ;b; *;"y chieu c6 hiQu diQn th6 hiQu dung kh6ng d6i vd tAn sd f : 50Hz vdo hai d;u cira ao+n *a.rr'go,,'; & i,'c *i" rAiii6p, iro"e do .,ron aav ti t*dng, t' diQn co diQn dung c bi6n 10' d6i. Khi tu diQn co diQn dung Cr : ';F thi cucrng dO hiqu dgng cua dong diQn xoay chi€u chay trong 3.10-' m4ch c6 gi6 tr! cuc dai. Khi tu diqn c6 diQn dung Cz: #-F thi hiQu diQn th6 hiQu dpng o hai dAu tu 25n di€n c6 gi6 tr! cr;c dai. DiQn tro R co gi6 tri ld: D.60f) A.30 O B.4OO c.50f) Trarrs, 511 -MadAthi 5-18 Ciu 39: C5o' cAu dring: sung ngin trong v6 tuy€n diQn co th€ truy€n tli rat xa tren trdi d6t la do: ,d. Phdn xa li6n ti€p tr€n tAng diQn li vd trOn mdt riAt B. Phdn xa m6t lan tren tAng Aign li vir trOn mflt d6t C. Tluydn thing tt vitri ndy sang vi tri kia D. Ca ba cAu A, B, C ddu sai CAu 40: Chon cdu sai: A.Tia tii ngoai.kich thich sp ph6t qua+g cua nhi6uchAt B. Tinh chAt n6i bat vd quan trgng nhAt cuatia X ld kha ndng ddm xuyen , C. Thiry tinh th6ng thucrng trongiu6t eOi vOi 6nh s6ng khA ki6n nhtmg hAp thu manh tia tu ngoai D. Th4ch anh, nu6lc vd kh6ng khi dAu h6pthu manh AOi vOi c6c tia c6 bu6c s6ng trOn 200nm vd trong suOt dOi vsi c6c tia.co budc s6ng ttgan hon 200nm e;;;;, rrabi."" iac don dao dQng-diAu hda quanh vi tri cdn bing cria no. Bi6t ring cir sau nhirng khoing ,rriigl"" ua.;6,t;r thi dQng n^dng vd thc ;n; dao ding cua vat iai bing nhau. Ley e: 10m/s2, n : 10. fAn sO goc dao ddng cua con lic lir: A. 0,5ru radls B. z radls : C. 1,5ru rad/s D'2nradls CAu 42t Truy6n tAi diQn nang di xa phii dirng m6y bi€n dp tang thC la d0: A. Gidr-p hao phi dibn nanE tr6n clucrng aay tai Aien n. tang c6ng su6t ctra nguiin diQn C.GiAmc6ngsu6tonoiti6uthudi0nD.Tdngti€tdiQncriaddytAidiqn Cf;u 43: Chon cAu dirng: trong thdng tin li6n l4c bang s6ng v6 tuy6n diOn, ngtroi ta phAi biOn di€r-r s6ng diQn tu la de A. Ldm cho s6ng mang truyAn tii duqc nhirng thdng tin c6 tdn sO dm B. Ldm tdng ndng lugng cta s6ng dm tdn C. Ldm tdng ndng lucr-ng cira s6ng mang D. Ca ba cdu A, B, C dOu sai Ciu 44: Chon cdu sai: A. Anh sdng don sic ln 6nh s6ng c6.m6! mdu nnat ei*r vd kh6ng bi t6n sic khi di qua lang kinh B. Chiet sLrAt cria moi chAt trong su6t (ran, long, khi) aOi vOi c6c 6nh s6ng dcm sic co mhu kh6c nhau td klr6c nhau C. Thi nghiQm voi 6nh s6ng dcrn s6c cuaNiu-tqn nhim chimg minh l6ng kinh ldrn thay dOi miru sic cira 6nhs6nggr"ran6 , _ ! ^ D. Anh s6ng mdt troi ld h6n hqp cua nhi6u 6nh s6ng dcrn sdc c6 mhu bi6n thi0n liOn lqc ttr tim dOn do CAu 45: Ctrong d0 Am tai di€m A c6ch trgudn dm im bang 10-uWlm'. BiCt cudng d0 Am chuAn Io : l0-r2 Wl m2. Xem rdng ngudn 6m ld ding hucrng, ndng luong cira s6ng Am trii ra tr€n cltc mdt cAr-r ngiry cirng mo rOng, bo qua su hAp thu 6m cira khdng khi. Khodng c6ch tri ngu6n 6m d6n di6m md mirc cuong dO dm tai d6 bang 0 la: A.250m B.500m C.750m D. 1000nt Ciu 46: MQt m6y biCn th€ li tuong c6 cuQn so cAp g6m 100 vdng,_cuQ.n thlr c6p gOm 300 vong. Hai dAu cira ^ '1 ' A + nic v6i hai dAu ctra m4ch diQn g6m R, L, C m6c n6i ti6p, trong do R:40f); cuOn d6y li cuor-l thrr cap Ouoc n 0^6 10' tLropg co L : ''' Ht C : +- F; f : 50H2. Khi d6 c6ng su6t ti€u thp cira n-iach diqn thir cAp ln 360W. 7T 57t Hieu diQn thd hiQu dgng 6 hai ddu ctra cuQn scr c6p ld: A.25V B.5OV C.75V D.100v CAu 47: MOt mach dao dQng LC li tucrng c6 L:2.10-6H, C: 8.10-tf'vd cubng dp cgc dai cira dong diQn chay trong mach Io : 0,5A. LAy gdc thdi gian t: 0 ld lirc.ndng lugng diQn trtrcmg bing ndng ltrcrng tir tr.uorlg, d€1tich cua mQt ban ili;r0n vir cuong dQ ddng diQn chay trong mach dAu co gi6 trf ducrng. Di0n tich q cira mfit bAn tu diQn bi6n thi6n di6u hoa theo thoi gian t ld: JT . A. q:2.10-icos(2,5.I06r+ XN B. q : 2.10-icos(2,5.106t - ! ' n 4'" a.Ztt C.g : 2.10-'cos(2,5.106t * lJ C D.q: 2.10-7cos(2.5.106t - iF JJ Cffu 48: MQt con t6cCcrn dao dQng di6u hoa quanh vi trf cdn bing cua n6 v6i li dO cong s, bi€n d6 cong ,So, '.chu ki T vir vdn t6c v. Bi6u thirc ndo dudi d6y m0td dring mdi li6n h0 gifia s , So, T va v : , T' , ^) , 4rr' : T' ) ) a1 - t-2 A. sr 4 yl: go2 B. s, *J!!-rr- Sn, c.i .s, +u, =So, y.Z;sr+ vr: ^Snt 4nt " T! u' 4nt Tt u Cffu 49: MQt ch6t di€m dao dQng di6u hda.theo truc Ox nim ngang tuAn theo qui luit: x : 4cos(5n t - +) (cm). Tai thdi di6m,ch5f di6m di dusc qu6ng ducrng 5 : (54 + 2Ji) (cm) tinh rt hic bat 3 ',1 . cldu clao dong t:0, n6 co li dQ ld: A 2cm B.2cm C. -243 cm D. 2rl3 cm Ciu 50: Eflt rnQt hiOu diQn thd xoay chi€u u:200JI cos100Tut (V) vdo hai clAu mach diQn gOrn c6 R, C 10_3 rnic ndi ti6p, trong d6 R:50^6f), C: j E. Khoang thbi gian ngfn nhAt tinh trlrthcyi di6m t:0, Jn dong di€n tric thoi chay trong mach c6 gi6 tri bbng -2A li : 1-1 73 A. s B naj 400 1200 400 - HCt Trano 1l'7 *Mi rlAtlri 53R oAp Ar.{ cAc rrA sc CAu 312 425 538 651 I D A C C. 1 C A A D 3 C D A A 4 A C A C f C A C C 6 A A A A 7 A C C B 8 C C D D 9 C A D B l0 A A A A 11 D D A A t2 C A B C 13 A C A D t4 D C C D 15 A A D B 16 C B C B. t7 D D D A 18 B D D D t9 A A C B 20 B C C A 2t A C A C 22 C C B A 23 D B C C 24 A A A A J< C C A C 26 A C C A 27 C A A C 28 A D A C 29 C B C A 30 A A C C 31 A C D B 32 B D B C 33 D B C D 34 A D B B 35 D A D D 36 B C C A 37 D A A C 38 B D B D 39 D B A A 40 C C D C 4l A B D A 42 C A A C 43 C A A A 44 B C C A 45 A A D C 46 D C B A 47 C B B C 48 A D A D 49 B C C A 50 C D C D . tu di6n). ' 2C A. Wat, Wtt bi6n thi6 n diOuhda theo,thdi gian v6i cung chu ki T, cirng bi€n d0 W vd ciurg pha . B. Wa,, Ws bi€n thi n diAu hda theo,thbi gian vdi ciing. vd ngucrc pha TW C. Wot, W6 biOn thi n diAu hoa theo thoi gian v6i cirng chu ki :, cung bi€n dQ* ua nguoc pha 2' 2 D. Wat, Wrt bi6n thiOn diOu hda theo thdi gian vdi. T,qH tuffng lam dng ten thu thi n6 thu c6ng htrong dr,rgc m6t song di6n tir c6 buoc s6ng 1.1 :300m. NOu mic thOm mQt tp diQn Cz n6i ti€p tu.li6n Cr thi mach dao dOng LCrCz thu c6ng