fufsii cdw ct6 4 plawaztg dn trri toi, Tlei sizuk choru w6t $l) pkuweg dn trd loi Faq p l'! nkdt C6u 1: Tai mQt di6rn c6ch ngu6n Am 10m thi e6 mric oudng d0 5m iA 90d8. FIdi taimQt di6m cach ngu0n 6m lin thi c6 mirc cudng ctQ Atn ld bao nhi€u? .4. l00clB ts. l20dB C" l10dB P' gfl0dB Cf,ur 2: Trdn mQt sgi cl*y dnn hdi dai 1,2 m hai dAu c6 einn dang c6 s6ng dDng, ngodi hai cIALr clAy cO r''ilntr co,r cO hai di$m kh6c -trOn dAy khOng dao rtQng vA thdi gian gifi'a hai lAn li€n ti6p so-i dAy duSi thdng la 0,05 s. V4n t6c truyAn s6ng tr€n ddy ln : A. i6 rnls. ts. 12 m/s" ' '" C" 4 mls' X)" I rn/s' CAu 3: lv{Qt s6ng co- lan truy6n trong rnQt rn6i trudng v6'i tdc dO 120cm/s, tAn s5 cira s6ng thay d6i tir I0F{z d6n 15i{2. Hai di6m c6ch nhau i2,5cm !q6n dao c16ng vr"r6ng pha. Bude s6ng crha sdng co cl6 lA: ;\" i2 cm ts" 10,5 cm,'- C. 8 cm B" i0 cm Cf;u z$: M6t ngu'di cluan sdt mQt ciriec phao tr€n m{t bi0n th6y n6 nh6 cao l6n 5 lAn trong B gifry vi thAy kho6ng cdch 2 ngon s6ng kA nhau ld 2m- VAn t6c truy6n song bi6n ld : A. I m/s E. 2 rn/s L. i+ m/s ll" Bin/s C&m 5: Khi c6 s6ng clitirg trdn mot sgi Aay elirn hdi Ats hai cidu cd dinti thi thdy tr0n dAy c6 7 nfit. Bidt tdn sd s6ng th 42Hn V6i clAy Ats vi van tdc truydn sdng nhu tr6n, mudn trOn dAy cci 5 nt'it thi tdn s6 s6ng phii li A. 28F{z E. 30Hz C- 53}{2 D" 5B{Iz Cftu 6: Khi s6ng Am tmydn tir kh6ng ktri vdo nu6c thi bu6c s6ng: A. Tang B. Gi;im c. Kh6ng ddi D. Ban ddu giirn sau d6 t6ng Gaul Z: HaOt dAy ddn trOi r6t ddi c6 elAu A clao ddng v6'i tAn sd f theo pliuong vudng g6c v6'i dAy. Ei0n dQ dao clQng ld a, vfln i6" tr,tyen s6ng tr0n clAy ld 4rnls. Xdt di6m M trdn ddy vd e6ch A mQt dq4n -14qrn, ngLtd'i ta tn6y nA lu6n dao dQngngug'e pha vOi A. Bi€t tdn sd f e6 gi6 fri trong khodng tir'98Flz ddn l02FIz. Btr6c s6ng cria s6ng d6 c6 gi.{ tr! ln A. 2 cin B. 3 cm 0' 4 crn D. 5cm {lau E; F{ai ngudn s6ng fr€n mat nu6c lh S, vb S, phdt ra hai dao ddng c6 phuong tdnh u, = asincrrt vb il, = acos(,)t. S6ng kirong suy gihm, Cho S,Sr_ = 1 1i". 56 didm c6 bi0n dg cqrc dai tr6n SrS2 la A"Zt 8.22 c.23 D.24 {ifru 9; Trong thf nghiQm giao thoa trdn rn{t nutie, hai ngudn ki5t hqp A vd B dao dQng cirng pha vdi chu k}' 0,05 s. tsiilt 6e d6 truyAn s6ng trdn m{t nudc ld 3Oern/s, AB : 8crn. tv1Qt dud'ng trdn R :2,5 Qffi e6 tdni t4i trung etri$m 0 eila AB, nim trong mdt phdng ch{ra c6e vAn giao thoa. 56 diOitr clao dQng cgc dai trdn cit-rd'rtg trdn trA A. 10. B. 14. c. 16. D. 18. $an s{QC r{F{cA ruQC TUNF{ISN ?.RT. U#NG T'S{FJ'H' C}TIJYfi N KF{T'N " - r-']1 " - ". - md s'xse tr{{JeA{ FXQC H,AN 4 F{ARa FI{}c 2s1e} - 2{}13 ft/t&N T'HAE : V4t:: i,9 TkN gi*m ldw brli : 9{} ph{ti C" 5 tui{-{z CArx trg; Ngudn drn diiSm S ph6t ra s6ng drn truy6n trong rnOi trr-Ld'ng ddng hrL6ng. Co hai di6m A vdL B ninr tr01 nr,?a dudng thting xu6t ph6t tir S. Mf'c cud'ng c16 6m t4i A ld La : 40 dB t4i B la I-;r: 60 dll. Bo qua srL hAp thp 6nr. lr{uc cud'ng dQ 6m tpi trung diOm C cria "\f} ld A" 45,19 dB. B. 46,67 dB. c" 50 dE. D. 52,26 dB. Cftna l?: D.1t vdo fiai dAu rnach xoay chi€u n6i Uilp hi€u diQn th6 u:200cos(l00nt + xl6)Y ilri cuo'ng il6 dong ctiQn trong nrach ld i : 20cos(100ru1 - n/6) mA. Cdng su6t ti€u thu trong mach ld. A. 1V/ i3. lkw c.2w D"2kw Cffg trZ : Mach RLC n6i ti6p g0rn cuon d6y (L, r) vd tu c1i6n C. EAt vAo hai dAu clo4n mach m6t hidir diQn ttr6 u = 30JIcos100zrr (V). DiAu chinh C dC Uc : Ucn,on : 50V. HiQu diQn the hieu dung giiLa hai dAri cuQn e16y khi d6 ld: A.30 V B.40 V C.sOV D.80V C#u 13: Y'hrurg chon s6ng g6m cuQn cAm L vd 2 tu Ct,Cz. N0u chi dtrng L vd C1 thi thu duo.'e s6ng c6 L1 : X00 m. N6n chidirng I- vd Cz thi thu rluo-c s6ng 1"2:75 m. I{hi dnng I- vd haitr.t C1 , C2 sollg song nhau ttii khung thr.r du'<t-c s6ng c6 bu1:e [A D. 175 m A.25 rn Il. 60 nr C. i25 nr {lftu i4: }"{ach LC gdm L vh C,, Cr. Khi dtrng 1. vh C, thi khung bit riuoc s6ng cli6n tir c6 f = 3 fu{Hz, khi riirng tr, v) C, thi kirung b*t duoc s6ng c6 f = 4 MF{2. Khi ding {- vh C, n6i tidp v6i C, thi khung bat dum sdng rli6n tfu c6 tdn sii lI A. i rvHz E" 2,4lv{}{z ]f," 7 V{Fiz Ida {id fhi: Jltr d*^ : VX{V,t €.i. nr n5: V{peh rJao rtgng diQm tfi' tu alo {.C. &40t n&'a ndng truc.'ng diQn tnu}ng er,;'l: efai trong tu cltu5r$s gfu}1111 nbng luomg til trong cu0n edm m6t tho'i gian t6. Chu k! elao dQng dlQn ttr trong mach !i-: A" 2to E. 4to C. 8t6 $" 0,5t0 ' Cftu 16: *)Oi vOi s$ lan truyOn s6ng diOn tt thi vectCI eu'd'ng rJQ diqn trudng -E vA. vec.to'cAm rlng tir E : A. E vd 6 tuOn vudng pha v6i nhau li. E vd d luOn cirng phuong v6'i phuo-ng truyAn s6ng. C. d vd 6 luOn nguo-c plia vdi nhau D. E vA d luOn vu6ng g6c vdi phuong truyAn s6ng. CSu 1?: Mach daodOngc6 C= 6nF, L,= 6pH. Domachc6cli0n tr&R. = 1 f), n0ndaoddngtrong machtilt i ddn. Dd duy tri dao ddng vdi hi0u didn thd cuc ciai gifta hai trAn tri di€n lh Uo = trOV thi phii b<l sung ndng luong cho mach mdt cdng sudt li ' A.P=20rnW B.F=30mW Cftu 1E : Vtrach dao d6ng c6 C .= 6nF, n- =,6 ltFi. Do nlach c6 R = 0,5 f) , ndn clao rtdng tr"ong mach tit ddn. Dd duy trl dao ddng vdi hi0u diCIn thd cuc aai gifa hei bin tu ctriOn lh Uo = 10V thi phAi bd sung nlng iuong cho rnach mdi c0ng sudt lh A. F = X5 rnW B" F = 20 inW, C. F = 25 mW I)" 30 m\fr/ CSs! tg: Tror;g th{ nghi€m giao thoa l0ng, khodng erich krai kire 'a: A,Zntm,tir hai khe d6n n'lAn D :2m. Bi-'re xa r,ton sfc S c6 A = 8,5 pm. Trong khoang r6ng 5 enr trdn r ndn t{nh tir vAn sSng trung t6m, s6 v6.n t6i quan s6t ducrc lh: .4.9 B. 10 C" 11 D. 12 CSm ZCI: Thi nghi€rn giao thoa dnh sfng v6'i khe Young, chi0u cl6ng thdi hai bfic xa don sfc c6 bLi6'c sting I1 :0,4Epin vd l,z : 0,54prn. Ngrro'i t.athdy vAn s6ng bAe 4 cfra bue xa L1 trirng v6'i 'zdn sdng bAc k cira )"2 . Gid lri cura l< li: A"2 8.3 {"4 E}.5 Cfiu Ztr: Con li,e ld xo treo thdng c1irng dao d6ng diAu hoa v6'itAn s6 f : 2,5 TIz vd bi€n dQ A:2 cra. Ti s5 dQ ldn lue dAn h6i circ dai vri crrc tir5u crira ld xo k): A.3 8.4 C.5 D.6 CAqi 22: Con ldc lb xo c6 khdi lirtr. ng rn = 100 B, dao cldng didu hoi vdi co ndi.rg E = 32 mJ. Tai thrli didm ban rJSu vdt c6 vAn toc v = 40J3 crnls vi gia tdc a - - 8 rn/s2. tsidn d6 cira dao ddng lh A.3em B.4cm C.5cm D.6cm C&rlr ?3: Con 16c lb xo cd khdi iuorig m =, 100 g, daro c16ng di€u hoi vdi bi6n dd A = 2 cmr. Tai thli rlidm ban ddrr vAt c6 vAn t6c v = 20^,6 cmls.zh gia tdc a = - 4 mlsz. Fha ban ddu cira dao ddng lI A. -n 16 E. n 15 C. -2n 13 D. -r 13 CSu 24: Con lac ld xo c6 khdi luong m = 100 g, clao cl6ng didu hoh vdi co ndng E =32 mJ. Ttii thbi didin ban diiu vAt e6 vAn toc v = 40",8 cmls vi gia t6c a = B m/s2. Pha ban ddu cria dao d0ng li t\ nl1 n,].nl6 C"-2nl3 l] nl3 Cfer"l 135; IvI0t con lic lb xo cd m = 5009, clac ctdng didu laoh vcfi co nbng E = trO rnJ. I dy gdc thci gian khi vAt c6 vdn tdc 0,1m/s v) gia tdc li - Ji *ls' . Pha ban ctdu cria ciao t16ng lh A.nlZ E xl6 C lr& D nl3 C*u 26: Ddng hd qui lac chay drhng gib trOn mAt eidt E nhiOt do 270C. DLra ddng hd len dinh nfi cao h = 640 nr th) ddng hd vAn chi ifting gid. Cho tiay treo con laic c6 rx= 4.10_5K-l, bdn kinir trdi ddt R. = 5400km. Nhiet dO tr0n dinh nrli l:\: A. t20C TJ.220C C. 250C D. 350C Cftu 27: Trong clao dQng tXt edn dai ltro-ng nio sau ctfiy ld kh6ng ddi A. TAn sd B. N6ng luirng C. Bi0n ciO I). Khdng c6 d4i lnirng ndo {lAu 28: Con lic lb xo cti khdi luorrg in = 100 g, d0 ct'rng k = 50 }I/rn, dao d6ng didLr hoh theo phuong th&ng dring. Ndu vAt m ndi vdi ld xo b&i diy rndm, khOng d6n tli biOn dd A phAi & trong gi6i han nio thi vAt clao +. i (iong fllelt lloa / A.A<lcrn E.A<2cm C.A<3cm D.A<4cm CAu 29: Vdt tham gia ddng thdi hai dao d,3ng cti phuong lrinh: r, = cosIjnt cm vb ,r" = 4sinl}nt cm . Vdn tdc cirn vAt khi t = I s ld ,4. 40 cnr/s E" 40".1J cmls C" 40 r crnls D. 80 n" cm/s ./ c.*aa 3{}: 'ltoi1g cl6ng cir- l<hring ddng h6 ba plia, chcn nhan diril-r clfing / r\. {dhi hoat cX0ng dinli n'rfic thi rdto quay ddrr B" VAn tdc g6c cria rdto bang tdn sd g6c cta tit fruing qnay C" fi.Oto khOng quay ddu, v6n t6c g6c trung binh nh6 hon tdn sci gdc ctra tir trulng quay n. Va" t6c giciO ing 1yn lion tray nh6 hm, rnQj cdch bdt k!, pliq ttru6c vho cdng sudt cira dsng co Cffu 3n: Dat vdo hai dAu mach xoay chieu n6i ti6p higu clien thc u:200cos(100nt r- n/6) V thi cubng dQ ddng di€n trong mach ld i : 20cos(100nt - n/5) mA. Cdng sudt ti0ri thu trong rn4ch lA A" I W E" 1 kW {-2W T}" 2' kW Csu SZ : Mpch RLC n6i tirSp g6m eudn d6y (L, r) vd tr; clign C. D?t vdo hai dAu do4n m4ch mQt hiQu cliQn th6 u: 30J7cos10 ynt {V}.*ti}u chinh C d6 U"': Uc,o* : 50V. HiQu r1ign th6 hieu dpng giira hai clAu cuQn ddy khi d6 li: A.30V 8.40V i,ri c'50v D'60V CAu 35: Khung chon s61g g6rn cugn cam L,vA 2 tu Cr,Cz. NAu chi dirng L vd Cr thi thu clugc s6ng c6 1"1 : 100 m. t{6u ehioirng L vJC, tni thudugc s6ng }"2 = 75 nr. Khi dirng l, va haitu C1 , c2 song song nhl:u thi A.25 m khung thu rltro-c s6ng c6 budo ld ",' C. 125 m D. 175 m khung bat duo. c s6ng di6n tir c6 f = 3 'It4IIz, khi ding L vb C, ndi tidp vdi C, thi khung b6t clLroc 8.50 m Cfeu 34: NXach {-C gdrn L'ud Cr, Cr' Khi dDng L vh C' th) clilng tr, vh C, thl khung bat clutvc sdir.g c6 f = 4 N4Hz' Khi s6ng clidn iir cri tdn sd l) A. 1 h,4F{z B. 2,4 MF{z C' 5 N4FIz D' 7 }vIHz CSu 35: Mach dao ri6ng dien tir tq do LC. Szldt nira ndng l,-rong rJi€n truo'ng er;Lc d4i trong tu chuydn thinh pdng lu'ong ttr trong ci-r$n e6.,r mAt thd'i gian ts" Chu ki' dao dQng diQn tr)' trong m4ch.1d: A" Zto B.4to C' 8to D' 0'5to C6un 36: p6i voi s11 lan truyon s6ng diQn tii'thi vecto r1g"g d0 diQn truong E vd vecto edm ri'ng til E : A. F vd n tru6n vu6ng pha v6inhau B. E vd B iu6n eiing phuong v6'i phuc;-ng truyOn s6ng" C. g vd F lu6n rlguoc pha v6'i nhau D. E vd 6 ludn vu6ng g6c vdi phuo'ng tnryAn s6ng' ' Cfru ST: iViach daoclong"6 C= 6ilF, L= 6pi{. Domachc6ciidn tr&R = 1 f), nen clao c16ng trong miLchtdt ddn. Dd duy tri dao d61g vdi hieu di6n thd cdc clai gifia hai bin tu di0n 1) Uo = 10V thi phii bd sr"rng ndng lurony, cho rnach mdt cOng sriiit l) ,A. Ir;20 mW E. F = 30 urW C. P = 40 rnW l). P = 50 rnW C6u3S; fuiach rlaod6ng cri C = 6nF, L - 6 pLF{. Do machc6 R = 0,5f), n€n daoci6ngtrong mach tnt ddn. Dd cluy rri clao ddng vd'i hieg c1i0n thd cuc dai gita hai bin tu cli0n th U0 - 10v thi pirhi bd sung ndng lr"tong cho mach mOt cOng su{t l} A.F=i5mW B.F=20mW C.P=25mW D'30m1i/ Cfirx Jg: Trong thi nghiorn giao thoa iAng, khoing cich hai khe a: 0,2mm, tir hai khe dtln mdLn ll :2m' Birc ;il; ,4, S "O n Jg,il*,. 'T'rong khoing rqneJ cm tr€n rndn tinh til vAn s6ng lrung tArn, s6 vdn tdi cluan sat dtLoc la: A"9 8"10 c.il w'12 Cji* 443: 'l-hi nghi6m giao tlioa 6nh s6ng v6'i khe Young, chi6Lr dAng thsi hai biLc x.a don sic c6 bu'6'c song ?"1 : g,4Eprm vA )"2 0,6IpLm " lqgrrd i ta thhy vdn suing b6c 4 cira bfic xp 1"1 trdng v6'i vAn s6ng bflc k cL"la ?"2 . GiA tri ciia k lA: A."2 8"3 c"4 D"5 ceu, al, Chi5u brie xa e6 brr6.e s6ng ), vdo cat0t cira mQt t6 bao quang diQn thi hiqn tugng q'rang diQn xny ra'bc irigriieu noa* iodp ddng qt1*ng diqn thi hiQu diQn th6 ham c6 eIQ lo,n 2 v. NOu d4l. giiil an0t vd,catdt e lra tri bdo quang diCIn hieu elen ttre ulq ^ 3 v thi dOng ning clrc d4i cira 0lectr0n qt-rang di* khi l"^i,tiot ld ;]:dlnjr' o ;' B. e,f.to-le i c. l0-r8 J I). 16.10''' i Csu,$?:'T'rong giao thoa iinh s6ng cfra luolg ling kinh, c6c llng kinh g6c chi6t quangld 4.10-3 racl, chi6t suAt n = l,5.llgie' rjc,n s,i,r c6 ?" 0,6;.un cdch lrrOng l6ng kinh mQt ctoan d:50 cm, mi"n cich lrr:6'ng ti'ng kintr i,: 1,5 m. Khoeng viiri i c6 giA tri la D" i='0,5 rnm A" i :0,2 rttnt tr3. i''= 0,3 min C. 0,4 mm Cftu 43: Khi m6t tia sdng mlLr c16 truydii t& khdng hhi vbo nudc thi budc s6ng: A.';1.[ng B. Giim C. Khong rtdi D. tsan cldu giAm sau d6 tdng Ceu 44 : Tia trr ngoai khdng c5 tfnh chdt rrho sau ilAy '7 /" A. Tdc dung 10n kinh dnh B. Lhm ion hod khdng khi / C. Khdng bi nudc hdp thq D. C6.thd gAp ra hi0n tu-d. ng quang diQn / C6u 45: Trong nguydn tri hidrd khi dlechon nhAy tit qyy d?o N v€ qu! dpo L thi nguydn tri'hitlrO phft rabftc x4 c6 bu6e s6ng 1.,, khi Clectron nh6y tir qu! clpo O vA qu! dpo M thi ph6t ra birc xp c6 budc sOnpl lr. Tim k6t luAn d*ng: I . A" 257,"2 = 36Ir E. 5l.r = 6Xz C. 2561"1 = 6757"2 D" 256X' = 6757\ i , Cffu 46: Chi6u birc x4 c6 A :0,405 pm vdo cat6lcria mdt t6 bdo quang cliQn c6 cOng tliorit A dC fao ra cldng quang di€n trong mach. Dong diQn quang diQn tipn'triQt ti6u nho mQt hiQu diQn th6 ham c6 gi5\tri 1,27 V. Cdng thoSt A cfia cat6t 1A \ a. l,ig eV B. 1,80 eV i'\ C. 1,82 eV D. 2,18VV CSu 47 : EQng ndng ban dAu egc d4i eria elgetron quang di6n t6ch khoi kim lopi khi chitiu 6nh ra\g tl,i"t't hqp kh6ng php thuQc vdo : .*- li \ A. TAn s6 ctia 6nh s6ng kich tliich -7 "i "''' B. Bufc s6ng cfia 6nh s6ng kich thich C. Bdn chAt kim loai dirng ldm catOt D. Cud'ng dd cfia chirm siing kfch thich C&u 48: T'inh chu kj' b6n rd T cria rndt chdt ph6ng xa, cho bidt tai thdi didm t,, tf sd gifia hat con vh'hat mg lh 7, rai thdi didm t, sau t, 414 nghy, rf sd d6 lh 53. A. 125 ngly B. 138 nghy C.207 ngity D. 55E ngly CAn 49: Ddng vi Na24 ph6ng xq F v6i chu kj'b6n rd T, tao thinh hat nhdn con Mg24. Tai thdi/didm bat ddu kh6o s6t thi tf sd khdi luong Mg24 vi Na24 ld U4. Sau thdi gian2T thi tf sd tr€n lb A. 1 8.2 c.4 D.0,5 Csu 50; Cho ndng iuong li6n kdt riong: cisa a li 7,lOMev; cird ufani {J234ld 7,63Mev; cria thOri Thm0 h '7,70Mev. l.l5ng luong toi ra khi mQt hat nhdnU234 ph6ng xa a tao thhnh Th230ld A. t2 MeV B. 13 MeV C 14 MeV D. 15 MeV e'=i: . dtrng 1. vh C, thi khung bit riuoc s6ng cli6n tir c6 f = 3 fu{Hz, khi riirng tr, v) C, thi kirung b*t duoc s6ng c6 f = 4 MF{2. Khi ding {- vh C, n6i tidp v6i C, thi khung bat. F v6i chu kj'b6n rd T, tao thinh hat nhdn con Mg24. Tai thdi/didm bat ddu kh6o s6t thi tf sd khdi luong Mg24 vi Na24 ld U4. Sau thdi gian2T thi tf sd tr€n lb A. 1 8.2 c.4 D.0,5 Csu. s6ng g6m cuQn cAm L vd 2 tu Ct,Cz. N0u chi dtrng L vd C1 thi thu duo.'e s6ng c6 L1 : X00 m. N6n chidirng I- vd Cz thi thu rluo-c s6ng 1"2:75 m. I{hi dnng I- vd haitr.t