ĐỀ THI THỬ CAO ĐẲNG - ĐAI HỌC 2011 :TRƯỜNG THPT ĐÀO DUY TỪ HÀ NỘI MÔN LÝ docx

Ddng co khdng tl6ng bQ ba pha vd m6y ph6t diQn xoay chiAu ba pha c6 tti€m chung vd nguy6n tic ho4t tlQng lA dga tr€n hiQn tugng cdm fng tlign tir.. ROto cria dQng ccr khdng tt6ng bQ ba p

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D*e duy Tu _

"U'*0,

ue tni thfr tl?i hgc ilqt 4 -.27^/0212011

1r'hdi gian rim t#;'Jilllfffii, thdi gian phtrt tld)

vra aA nri; cor

1Od ttri g6m 5 trang -,50 cffu h6i) Cdu l Mdu do cta rubi do ion ndo phit ra?

A Ion cr6m B Ion 6xi c.Ion nh6m D C6c ion kh6c

Cdu Z MQt con lic ld xo treo th.ang d,inq, dAu tr6n gan c0 dinh, chi€u,dd-i tu nhi6n lo : 40cm Dua vflt

Jc" = l0 ,i.* m/s2; n2 ,"" "illl : 10 ChiAu -" [rro"g Oaii* bi6" nhAt ;?"g cria ld xo ,di buong khi nh!, vQt dao v4t dao <tQng <l0ne bingdiAu hod vdi chu ki r = 0,4s LAy g

CAu -;.;i;" 3 S6ng ha 6m:

.A

"f'O hon 20kHz B Kh6ng truyAn dugc trong chAt rin'

C Truy6n trong nudc chim hcrn trong kh6ng khi D Truydn dugc trong chdn khdng-

. C6u 4 Cho do4n mach nOi tiep AB theo thri'tg gdm mQt diQn tro, mQt cuQn cAm thudn vd mQt tg

tlipn Gqi M ld tti6m nfli gifa Oien tro vir cuQn cdm, N ln di€m nOi gifra.cuQn leT vd tU ttign DAt vio hai d}u do4n m4ch *9t aign 6p xoay chidu, khi d6 diQn 6p tric thdi giira hai diOm A vi N li

pha nhau 600 DiQn 6p hiQu dung giira hai ddu dopn mgch Uas bdng

Cdu 5 Trong m4ch dao dQng tti6n tir, c6c d4i lugng dao dQng cilng pha v6'i nhau ld:

A Dien tfch c0a tU ttipn vd cudng d$ ddng diQn trong m4ch'

B Cucrng dQ ddng diQn trong m4ch vd n6ng lucrng tii truong trong cuOn cim.

C.DiQn tich cfia tq diQn vi ndng lugng di€n trutrng c0a tq diOn'

D Cudng dQ ddng diQn trong m4ch vir cim ri'ng tu'cia til trudng trong rn4ch

Cdu 6, Tron[ thi nghiqm y ing,khoing c6ch giisa2 khe s6ng Fr vd Fz le 0,48 mm Khoing c6ch til mlt

phing hai r"n" een"*ln ld D.6nicu vdo khe F chirm s6ng don sac c"o buoc song ld 1" Tai di6m M tren mdn c6ch vdn trung tdm 9mm ld vi tri vin s6ng bflc 6 Khi dich chuydn mdn di 0,6 m theo phuong vuOng g6c vdi mdn thi t4i lvl-c6 vdn t6i thir'5 Bu'6'c s6ng l' bing

A.0,72 pm B' 0,4 Pm C' 0,54 Pm D' 0,48 Prm

CAn 7 Chgn cdu trd ldi khdng dirng vA citc tia ph6ng x4 u vd B:

A Tia cr vd p d€u li c6c dong hat mang diQn.

B Tia o ld dong c6c h4t nh6n c0a nguy€n tfi' HCli ( i H")'

C Tia B li dong c6c h4t €lectron ho{c p6zitron

D Khi di trong-dign tgong d6u theo phuong vr-r6ng g6c v6'i drrd'ng s6'c ttt, so v6i phuong ban dAu thi tia ct lQch nhiAu hon tia B.

Cpu 8.'NguOn dm di6m S ph6t ra s6.ng dm.truyiin trong m0i tru'ong d6ng hudng Khi di til'di€m A

d6n di€m B nim tren nira du'dng thing xu6-t phAt til'S thi mric cu'd'ng dQ dm gi6m di 20d8 Cuong

dQ ' dm tqi trung di€m C cua AB nho hon cuo'ng dQ 6m t4i A la

A iO tAn B 30,25 lAn - C l0 lAn D' 5,5 l6n

Cdu 9 Tuong t6c di€n tir lir tuo'ng t6c nho sau diy?

C Lgc hat nhdn D Lr;'c ma s6t'

Cdu 10 Mgt con l6c don dao dQng diAu hoA, khi con l6c qua vi tri cdn bing vqn tdc cira v4t nqng lir 3gcmls Khi v4t ndng o.vi tr( co dO cao bdng},3 dQ cao cu'c dgi so vci'i vi tri cdn bdng thi v6n tdc cira v4t c6 d0 l6'n bing

A.24,49cmls B, 17,32cnls C.20cm/s D l0cm/s

www.VNMATH.com

C6u 11 Trong thf nghiQm ve giao thoa 6nh s6ng, khcdng c6ch giflahai fn.e f-a a,.khoAng.cach til'm{t

pia"g

"n,i" r,ii r.rrc ion'man'qian s6t la D, f ta tin s6 cria 6nh s6ng chi6u vdo hai khe, c ld v4n toc 6nh

rangirong ch6n kh6ng Khoing v6n i tinh theo c6ng thirc ndo dudi tldy?

A i-: cal(fD) - B i: aDf/c ,C i : ci(afD) D i = cD/(fa)

cf,u 12 Do4n m4ch xoay chi6u AB theo thri tu goq, ihot bien tro R, m6t tp diQn vd mQt cuQn d6y kh6ng

.thuin cdm, M ld di6m n6i gifra tU dign vd cuQn ddy EiQn 6p hai dAu do4nrn?ch une : 60J'cosl00nt (V); rtiQn trd vd cim kh6ng ctra cuQn dny ln r : 20f) vir Zr = 601l6Q; dung kh6ng cria tp li

zc:40Jjc) Thay aoi n <16 c6ng sudt tieu thp tr6n do4n mach AM la cgc d4i Gi6 tri c0a R vi cong sudt cpc dpicl6 bing ':'

A 40Q vd 30w B l4Q vi 28,4W c 40o vi 45w D 54,6Q vd27,5W

c6u 13 chgn d6p 6n sai Tr6n mQt d6y dirn hiii, s6ng tdi vir s6ng phan x4:

C Truy€n ngugc chidu nhau D' Ngugc pha nhau'

C6u 14 Trong m4ch dao dgng dign tu li tudng, biOu thric cria ddng di€n trong m4ch le

i : gcos2nt/T (mA) T4i thoi di6m t : Tllzthi hiQu diQn th6 giffa hai ban t,,r dien ld 4v Dien dung cria tq diQn trong m4ch bing 5nF D0 t1r cdm cira cuQn cim b[ng

A i,67 *H B 3,34 mH c 5 mH D' lo mH

CAu 15 Chgn cdu sai vA tia t& ngoSi

A T6c dpng l€n phim 6nh ac rhup 6nh ban d6m B' Kich thich nhiau

?h.ui Pg ho6 hqc'

c Kh6ng

"6 te" dqng nhiQt D Bi nu6c vi thu! tinh hdp thq m4nh' CAu 16 MOt lazephitra nhfrng xung 6nh sdng c6 budc s6ng 0,64-pm, thoigian k6o dii c0a mQt xung lir 200ns, c6ng su6t cria chirm tializele l0w adi c = l.to8m/sih :6,,625.10-35s s6 phot6n chfta trong m6i xung 6nh s6ng bdng

^-"";;,il

ioltnu, 8.7,32.1012 hqt c 8,25.1012 hpt D 9,53.10r2h4t Cau l} pftat-Ui6" nao sau d6y ld kh6ng dfng vd dao dQng diAu hod c0a con lic lo xo?

A.NdnglugngdaodQng,phqthuQcvdoc6chkfchthichband6u'

B DQng n6ng cra uai UIen

1n.e" f.ia" foe.n _v^oi lT ro g6p d6i tAn 96 cira lid0

C Thdigian vat Ai tir v! tri bi6n d6n vi tri bicn bang mQt nri'a chu ki dao ddng cfra vdt

D Hqp luc t6c dung viro vQt dao dQng c6 gi6 tri cu'c d4i khi vQt &.vi tri bien

Cdu lg Nudc trong tu nhi6n c6 chila b,otix nudc ndng D2O, n6u'c6 1 kg nuoc d6 t6ch toirn b0 s6 nguy6n t0 I D ra vir rhuc hiQn phan fng nhiQt h4ch thi^ndng luong mir ta thu duo c li bao nhi€u?

Cho: """'r,.'i,0il'.io6i mo :2,0136u; m1:3,016u; B.3,28.lO2rMev mo: .l,O0Zlr; luc2:931M-eV;Ne:6,022.1023nguyOn c.l,82.l022Mev D' 5,831'1OeJ t0/mol'

Cdu 19 Trong m4ch RLC kh6ng phan nhanh dang xdy ra cdng huo'ng T[ng tdn s0 cira dbng diQn, ki5t ludn nio du6i ddy lir sai?

A Cudng dQ dong diQn trong mach giArn

B He sOiOng tudt c,iu doan mach giim'

c sa

"ni "t u *n r.c ri trr^g *a" iiiru hai dAu do4n m4ch gOm tg diQri ve cuon cam tiru0n tiirg.

D SO chi cira vOn k.5 li tuong mic giffa hai bin tp diQn gidm'

C;i,g20 Anh sdng dugc dilng trong thf nghiQm YAng c6 bu6'c song 0,6pm trong chdn kh6ng, hai khe s6ng c6ch nhau 0]5mm vd c6-ch *a; t; irau aat tod"n b0 dung cr,r Ihi nghiQm trong nu6'c c6 chi6t sudt 4/3 thi khoing c6ch gifi'a hai vdn s6ng b4c ba tr€n mdn ld

A.l9,2mmB'l4,4mrnC'12,6mmD'l0,8rnm

9d, Zt Oieu ndo sau ddy ld sai khi n6i v6 dQng co kh6ng dOng b9 ba pha vd m6y phrit diQn xoay chiAu ' ba pha?

A Ddng co khdng tl6ng bQ ba pha vd m6y ph6t diQn xoay chiAu ba pha c6 tti€m chung vd nguy6n tic

ho4t tlQng lA dga tr€n hiQn tugng cdm fng tlign tir

B Trong ddng co kh6ng d6ng bQ ba pha vd m6y'ph6t dign xoay chi6u ba pha dAu c6 3 cuQn ddy gi6ng nhau

C ROto cria dQng ccr khdng tt6ng bQ ba pha vd c0a m6y ph6t dign xoay chi€u ba pha dAu li nam chf;m diQn

D C6c sudt dign dQng trong ba cuQn ddy cria dQng icr khdng tl6ng bQ ba pha vA cria mdy phrit ttiQn xoay chiAu ba pha ttdu c6 rlQ lQch phald2nl3.

cdu22, MOt chdt dir5m dao dQng di6u hod c6 phuong trinh: x:_4cos(5nt + nl6) + lcm Trong gidy diu

ti€n chat di6m qua tti6m cd tua d0 x: -l cm thio chicu ouong mdy rAnl?

Cdu 23 Trong m4ch dao dQng diQn til tg do, sau ll2 chu ki dao d6ng kC tt khi dong diQn dat cuc dai,

n[ng luong cria m4ch dao dQng t{p trung o d6u?

A CuQn cim B Tu diQn C d cuQn cdm nhidu hon D d tr,r diQn nhiAu hon Cdu 24 MQt khung ddy hinh chfr nhat diQn tich 7,8dm2 g6m 50 vdng, itugc it{t trong iit tiuong dAu c6 B:0,2 T Truc ttdi x*ng cria khung vu6ng g6c v6i tt truong Tdc d[-quay cta tcttung ld a0 vdig/ gi6y T& thOng qua khung c6 bi6u thirc O = O6cos(rrrt + nl6) Bi6u thfc su6t ai{n dQng cdm img trong khung day la:.

C e = l,96cos(40t+ nl6) (Y) D e: l96cos (40nt - nl1) (V)

Cdu 25 Theo thuy6t luong tri, ph6t bi€u ndo sau d6y li kh6ng dring?

A Chirm s6ng ld chirm c6c ph0t6n

B C6c phdt6n c6 nlng luong bing nhau

C Ndng lugng c0a mdt phdtdn kh-Ong d6i

D Trong chan kh6ng, photon bay vdltdc dQ c:,3.108m/s doc rheo tia sring

CAu26 HiQu diQn th€ gifra an6t vh kat6t cria mdt 6ng Ronghen la l2 kV,

"udng dQ dong dign qua 6ng ld

20mA C690yo d6ng nEng cia c6c Olectron bi€n thdnh nhiQt ldm n6ng andt 81 qua do.ng nang c0a c6c

€lectron khi bft khoi cat6t Li,y e : 1,6.10-rec NhiQt luong mdr anot nli6n ar-o iro;; zd pi,r, u|;g,

cdu27 Trong c6c loai tia ph6ng x4, tia ndo kh6c v6i c6c tia con rai nh6t?

cAu 28 MQt v{t dao d6ng,diAu hod v6i phuong trinh x: Acos(l0nt + xl2) Khoitng thoi gian de l/+

d6ng ndng chuy6n thdnh thd n6ng te tU t = 0 bing

CAu 29 Chgn.dfp 6n sai vA m6y bi6n 6p

A' M6y bi€n 6p ld mQt thiet bi dr)ng dd bi€n ddi diQn 6p vd tAn s6 cua dong diQn xoay chiAu

B M6y bi€n 6p hoat dOng du'a tr6n hidn tu.ong cim ri'ng diQn tir

C LOi mfy bi6n 6p ldm bing thqp ki thu4t diqn dA tanf cuong til'thdng qua c6c cu6n d6y

D LOi th6p dugc ghdp bang nhi€u tdm mong c6ch diQn dC giam ta Ou-ng nhi6t cira Aong eign phuc6 Cdu 30 Trong quang ph6 cria nguydn tfi' hidr6, bdn kinh cira quT dao c6 m['c ndng lLrgpg kich thich thf: hai ld I ,44a(a li mQt hang s5) B6n kinh cria quT dao c6 m[r'c ndng lLro.ng kich thichihir'+ f,ang:

Cdu 3 l PhAt bi6u ndo sau dAy ld kh6ng d0ng khi so s6nh sr;' ph6ng xa vd su, phdn hach'/

A SU ph6ng xa vd su' phAn hach d6u ld c6c phAn 0'ng hat nhAn.

B Su'ph6ng xa vd su phan hach ddu ld c6c ph6n ring hat nh6n toa ndng lu'ong

C C6c h4t tao ra trong rnSi ph6ng xa ld x6c dinh vd c6c hat tao ra trolig nhfr.ng ph6n hach kh6c nhau crha cirng mdt ddng vi cfrng ld x6c ilinh

I D Ph6ng x4.khfing thgc hiQn duoc phdn f'ng ddy chuy€n cdn ph6n hach c6 th€ x6y ra theo phAn fng

ddy Chuy6n

Cdu 32 MQt mach dao dQng tliQn tt gdm mQt tg diQn.c6 diQn dung C vi mQt cuQn cdm thuin c6 dQ tg

cim L, diQn dung C vd d0 tU cdm L dEu c6 thO thay,d6i du-ry c Ban dAu mpch cQng hu&ng v6i s6ng diOn

tu c6 budc s6ng 60m N6u gift nguy6n ttQ tU cim L v?i tdng diQn dung C cfia tg dign thOm 6pF thi m4ch cQng hudng vdi budc s6ng 120m NOu ginm diQn dung C ai f pF vi tang d0 tg cAm L lOn gdp 18 lin thi

m4ch cQng hudng vdi s6ng diqn tt c6 budc s6ng bdng

A 60m B 90 m C I 80m D.240 m

Cdu 33 EiAu ndo sau diy ld thing khi n6i vA dao ttQng tliAu hoi.cria mQt ch6t di6m?

,\ Chi6u e'i.a vecto uan to" ttrav e6i khi v{t qua vi trf cdn bing.

B ChiAu cfia vecto gia t6c thay ttdi khi vQt qua vi tri bi6n'

C Chi€u cta lr,rc k6o vA thay d6i khi v4t qua vi tricdn bing'

D Chi€u cfia luc ddn h6i thay d6i khi v4t qua vi trf bi€n

CAu 34 Trong thi nghiQm vO giao thoa s6ng ti€n m{t nu6c hai ngu6n ktit hqp A,B dao dQng cirng pha Mgt rli$m Vf irim trln vdn cgc tieu, giira M vd dudng trung trgC c0a AB c6 2 vdn cgc ti6u kh6c, bi€t

MA : 30cm vi MB : 37,5 cm Tren irEt do4n thdng aai n 25" trong khodng gifia A vd B , c6 nhidu

nh6t bai: nhi6u di6m dao d$ng v6i bi6n ilQ cpc d4i?

A 10

Ciu 35 Chgn <t6p 6n dring vA thri tg c6c birc x4 theo sp ting dAn cria tAn s6

A Tia hdng ngo4i, tia Ronghen, tia tft ngogi, tia gamma

B Tia hdng ngo4i, tia Rcrnghen, tia gamma, tia t* ngo4i

C Tia trl ngo4i, tia hOng ngopi, tia Ronghen, tia gamma

"O f.ftOi l;q"g Z.lO3ot<"g vi c6ig sudt birc x4 ld 3,8.1026W Ldy c: 3.108m/s;

A.5,25.td'nam B.7,5l.l0rrndm -C.8,23.10r3ndm D.g,l4.l0r3ndm

Cdu 37.C6ng thoft cira Olectron kh6i b4c ld 4,8 eV Ley h: 6,625.10-3aJs; c : 3.108m/s D6 €lectron bat khdi b0 mat t6m b4c thi 6nh sdng kich thich ph6i c6

A tAn sO f > I ,16.l0rs Hz B budc s6ng )" < 0,298 pm

C tAn sO f < 1,05.lOrsHz D bu6c s6ng l" > 0,258 pm

CAu 38 Chqn c6u sai Tgong hi€n tuong c6ng huong dao dQng co, bi€n dQ dao dOng cudng bric

A d4t cuc d4i khi tin s6 cira luc cudng bftc bang t1n s.0 rieng cria h.u di: dong

B d4t cuc d4i khi t6c dQ ti€u hao ning lugng do ma s6t rdt nh6 so vdi t6c dQ cung cip ndng lugrnB cho h$.

C c6 gi6 tr! cgc dpi phu thuQc ydo lgc c6n mOi trudng

D c<i giri ii'i ci-rc dgi cAng_ldn n€u lu'c cAn cing nh6

Cdu 39 Doan m4ch nOi tiep gdm mQt o'iQn trd, mgt cudn cim thuAn co d0 tU cdm L thay d6i dugc vA mQt t9 diQn Edt vho hai dAu doan mach mQt dien 6p xoay chiiiu: uee 60Jt cos(l00nt + n/4)Y EiAu chinh L

ae aiQn 6phiQu dung hai dAu cuQn cim d4t gif tri l6n nh6t vd bang 120 V Bi6u thirc diQn 6p gi0a hai diu

tq diQn ld

B uc:60Gcos(l00nt - n/12 )Y

D uc : 6016cos(l00nt - nl4 )Y

CAu 40 Chgn d6p 6n <lirng v€

-giao.thoa s6ngco.trOn m{t nu6'c

A Tgi noi vdng gcrn l0i g{p vong gon l6i c6 cuc cl4i giao thoa

B Tai nhfi'ng di6m tr€n vdn cu'c tiOu ld ch5 vong gon l6rn gdp vong gon I6m

C Nhtrng di€m tr€n vdn cuc dai dao dQng cirng pha v6'i nhau

D Nhfi'ng di6m trOn tr0n v6n cr,rc d4i dao-dQngngu'oc pha v6'i nhirng di6m tr0n vdn cu'c ti6u

C uc : g0Ji cos(l00nt - 5nlt2 )Y

Cdu 41 MQt ddng hd qud l6c khi d4t tr0n dinh n0i cao 600m so vd-i m4t ddt thi m6i ngiy d6m chay ch4m

' I ,l 88 giAy so vdi khi n6 cl4t tr6n m{t AAt Ctro hQ sd no ddi c0a ch6t lem thanh treo con lar ta 2

I ii5( I /d0), b6n kinh qud d6t ' A lon hon 60C R: 6400km NhiQt B nho hon dQ cr 60C mqt tl6t so voi tr6n dinh ntii

C l6n hon gOC D nho hon gOC Cdu 42 Tia s6ng dcrn sic do (bu6c s6ng l"p) truydn trong thuy tinh c6 chiiit su6t na: I ,6, tia s6ng tlon

sic vdng (budc s6ng Iy) truydn trong chdn khdng, tia s6ng don slc tim (budc s6ng 1.1) truyAn trong nudc c6 chi6t su6t nn = 413 K6t qui ndo sau tldy ld dring?

A.Iv>}"o>Ir B },E > lv> lr C.Iv>lr>Lo D.l'D>Ir>Iv

Cdu 43 Thi6n Hi cria chtng ta c6 dulng kfnh bing khodng bao nhi€u nim 5nh si{ng?

CAu 44 Coban !f Co ph6ng xa P-, ban dAu c6 1009 Trong 1 phrit d6m duoe 2,4g7.10r? hat B-ph6t ra.

Sd Avdgadr6 Nn - 6,022.1023 nguy€n trilTol; I ndm : 365 ngdy Ndu trong I ndm thi s^o^ hat B- phrit ra li:

A 1,3 l2.l023hat B 1,23.1023 hat C I ,534 t02'h4t D I ,41 .l023hat

CAu 45 Tai A vi B tr0n m4t chdt long tao ra hai ngu6n s6ng kiSt hgp c6 cirng bi6n d6 a : 2 cm

ngugc pha nhau, c6ch nhau 23 cm, budc s6ng bing I ,2 cm Di0m M nim tr€n do4n AB crlch trung

tli6m O cria AB ld2 cm dao dQng vdi bi6n tlQ bing

Cdu 46 EiAu ndo sau dAy li sai khi n6i v€ c6ng su6t cria ddng di€n xoay chidu trong do4n m4ch RLC?

A COng su6t ti6u thu ttign cria do4n mqch li t6ng c6ng sudt ti6u thg tr€n c6c ttiqn trd thuAn

B CuQn cdm thuAn vd tp ,rliQn kh6ng ti6u thq c6ng su6t

C Khi m6c n6i tiiSp th€m vio mach mQt cuQn cdm thuAn hay mQt tu diQn thi c6ng su6t cira doan mach co th6 tang ho{c gidm

D Khi mEc n6i tii5p thO-m vio mach mQt dien trd thuAn thi cdng suAt cfia doan mach tdng

Cdu 47 Mgt Aban m4ch giim mQt diQn tro R, m6t cudn cim thuAn vd mQt tu diQn mic n6i tiep Ddt vdo hai dAu dopn m4ch mQt dien dp xoay chi€u c6 gid tri hiQu dr,rng kh6ng d6i nhu'ng c6 tAn s6 thay ddi itugc

Khi tAn sO AO le f thi c6c diQn rip hiQu dgng hai dAu bi€n tro, hai dAu cuQn cam va hai dAu tu eian lAn luqt

bing Up : 60 V, Ur : 120 V vd U6 : 60 V Ni5u tdn sd ld fl2 th\ di6n 6p hiQu dgng hai ddu OiCn trcr Uing

Cdu 48 Chgn d6p 6n d0ng vA 6nh s6ng tr6ng vir 6nh s6ng don sfc:

A Anh s6ng tring ld chirm sdng g6m c6 bdy tia siing don sic til mdu do d€n mdu tim

B Mgi 6nh s6ng don sic md ta nhin th6y deu c6 bu'6c s6ng trong khodng til'chilng 0,38 pm d6n 0,76 pm

C Khi tli tir m6i truong k6m chi6t quang sang m6i trudng chi6t quang hon thi budc s6ng cria 6nh

!

s6ng dcrn sdc gi6m di

D Khi tti ti'm6i trudng trong su6t ndy sang m0i trudng trong su6t khdc, tia sdng c6 budc s6ng cirng lon thi bi l€ch cdng nhidu

CAn49 Sau 2 n6m rn6t lu'gng ch6t ph6ng xq gi6m di 4lAn Sau

so v<ii lugng ch6t ban dAu?

3 ndm ch6t ph6ng xq 6y con bao nhi6u

D U6 CAu 50 Ph6t biOu ndo sau tt6y ld sai vti cdc loai quang ph6?

A MAt troi ph6t ra quang ph6 liOn tr,rc

B Quang ph6 cira mdt trdi thu du'oc o tr6i dAt Id quang ph6 h6p thy

C Quang ph6 h6p thu cria chAt long ldr c6c vach hAp thu t6ch rdi nhau

D MQt ddn ph6ng di€n chila khf lodng ph6t s6ng ph6t ra quang ph6 vqch ph6t x9

Hnfng din gifri Od ttri thfr 6n 4 - ngiy 2712/2011

Mdn: Vit li - Mi d6 401 CAu l Mhu do cria rubi do ion cr6m ph6t ra khi chuyOn t* trang th6i kfch thich vd tryng thr{i co bin ->

Chqn A

= l0(5n)2 = 4cm Khi ttua v4t dtin vi tri ld xo kh6ng bi6n d4ng rdi bu6ng nhg thi biOn ttQ dao cl6ng c0a

vqt4=Al=4cm+chi6udei l6nnh6tctraldxoldl.u*:10+Al+A=40+4+4:48cm-+ChqnB.

CAu 4 Theo bii to uys vi une lQch pha nhau 600+ ues tr6 pha 300 so vdi i;

u4p lgch pha 750 so vdi uAs -+ ueN l€ch pha 450 so v6i i -+ ta c6 gidn tl6

vecto nhu hinh v6 Tir gidn dd vecto -+ Un: UnNcos45o = 60 Ji lZ:30JrV

> u.ce = unlcos3Oo = loJi l(Ji tzl = 20 J6 v-+ chgn B Ur.,ts

CAU 5 Trong m4ch dao tlQng di6n tir : Di$n tich cria tg diQn vi cudrng tlQ ddng diQn trong m4ch lQch pha nhau 900-r A sai Cuong tlQ ddng dipn trong m4ch vi ndng lugng tir trudng trong cuQn cAm cfrng nhu diQn tich cira tp itiQn vi nlng lugng <tiQn truong cria tp diQn khdng bi6n thi€n cirng tin s6 n€n kh6ng th6

so sdnh pha vdi nhau-+ B vd C sai Cuong dQ ddng di€n trong mgch vd cdm rng tir cria t& trulng trong mpch bi6n thi6n cing pha+ D dring + Chgn D

CAu 6 Khi min cfch m{t phing hai khe le D thi khoing vdn li i = },Dla = 916 = l,5mm (l) Khi mnn

dlch di 0,6m thi khoing vdn li i' = 914,5: 2mm -+ i'> i -+ D'> D-) D': D + 0,6 -) i' = l,(D + A,6)la (2) -+ Tir (l) vn (2) -) (D + 0,6)/D =211,5 -> D: 1,8m Tir c6ng thric i= ]"Dla-) )r.: ialD = 1,5.10r 0,48.10-3/1,8 = 0,4(pm) -+ Chqn B

Cdu 7 H4t a c6 kh6i lugng lon hsn r6t nhiAu so vdi hpt p ndn bi lech it hon so vdi hat B khi ditrong dign trudng -+ D sai + Chgn D

Cdu 8 t

Mric culng ttQ dm d B nho hon d A 20dB -+ cudmg <tQ Am d B nho hcm d A le 102 lin -+ Ia/ls : (SB/SA)2

=100-+SB/SA=10;lellc:(SC/SA)2=[(SA+SB)/2SA]2=(l+SB/SAF/4:ll214=30,25+ChonB.

Cdu 9 Lpc ma s6t sinh rac6c h4t mang tliQn n6n c6 tuong t6c tlign tt + Chgn D

Cdu 10 Chgn gdc th6 ning o v! tri cin bing, khi vflt d dQ cao h = FV3 thi th6 ndng cira vft bing ll3 cs

ndng -+ EQng ning cria vft bing 213 co n6ng -+ mv2l2 = 2(mv,u*2lZ1l3 -+ vz = 2v* ]B -+

v = 2v

^ *2 I .11 : 301 Ji = I 0 rE cm/s x 17,32 cm/s -+ Chgn B

CAu I l Tirc6ngthirc i==)tD/a,thay tr =clf -+ i:cD/(fa) + Chqn D

Cdu 12 Tg C ktrdng ti6u thu cdng sudt nOn cdng sudt ti€uthp cta do4n m4ch AM li c6ng su6t ti6u thp tr6nbii5ntr0,khitl6tli€ntrdcriabi(introp=,[;a17-2.y=@=40o.T6ng

-trd cta mqchZ= J(r+ R)2 + (2, - zr)' :./1zo+40)2 +(60Jt -40Ji)'= 40rEQ + cudng <t0 higu dpng trong mach bing | UIZ : 6Al$0.16) : Ji tZ1t1-r C6ng sudt ti0u thp tr6n dogn mgch AM te

p = I2R : (Ji tz'12+0 = 30w-+ vay R:40o; p:30w -+ chgn A

Ctu 13 TrOn mQt ddy ttin h6i, s6ng t6i vi s6ng phin x? ngugc pha nhau t+i dAu c6 ainn chfr khOng phni t4i UAt t<i di6m nio nOn D sai + Chgn D

Cdu 14 Tai thdi <li6m t =Tll}thi cuong tt$ ddng diQn trong mqch bing i = 8cos2nt/T = 8cosn/6 =

4"6mA Tt c6ng thric (i/ls)2 + (uru0)2: l-) $Jl tqz + (4/tjo)2: l-) hipu tlign th6 cuc ttsi giiia hai bin

tU diQn li Uo:8V Ta c6 CUo2: LIo2 -) L = CUozlti = 5.10-e.82/(8.10r)2:5mH -+ Chgn C

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Cdu 15 Tia tri ngopit6c dung l6n cdc lo4i kinh inh n€n cflng tdc dung lOn kinh inh dO chpp inh ban dOm

+ A dirng Cdu B vi D dring (SGK VLlz) Tia tti ngo4i cfing tic dung nhiQt -+ C sai -+ Chgn C

CAu 16 Ning luqng c0a m6t xung 5nh s6ng laze W : P.t: I 0.200.1 0-e : 2.10-6J-+ 56 ph6t6n chtia trong

mSixung6nhs6ngbingN:W(hcl}.):WV(hc):2.104.0,64.rc-646,625.10-34.3.108;= 6,44J012 h*t-r

Chgn A

Cdu l T.Khohngthdi gian ngin nhdt dd vat di tt.UiCn niy dlin bi6n kia bing mQt ntia chu ki dao dQng cria vft chri kh6ng ph6i khoing thdi gian b6t ki -+ C sai -+ Chqn C

C6u 18.TirdiAukiQndAubnitac6phuongtrinhphdnung in* iD-+lT+ jn.N[nglugngmiphin

img toi ra lA W: (2mo- m1- mn)c2 : (2.2,0136 - 3,016 - 1,0073)uc2:0,0039.931 = 3,63(MeV) Kh6i

lugng nu6c n{ng D2O trong.lkg nu6c tg nhi€n li 0,015%.1000 = 0,159 + sO hgt D2 bing

0,15.6,022.1023n0 : 4,5165.102rhpt Theo phin ung hat nhdn tr6n thi crir c6 2 hqt Dz thi cho ning lugng

3,63MeV -) t6ng ning lugng thu duo.c bing 4,5165.102t.3,63MeV:1,6395.1022MeV = 1,6395.1022.1,6,10-r3J : 2,624.1OeJ =+ chgn A.

Cdu 19 A M4ch dang c6 cQng hu6rng thi culng tlQ hi€u dgng cria ddng diQn trong m4ch d4t cgc ctgi, khi

ting tAn si5 cia ddng tliQn thi cuong ttQ higu dgng ddng diQn trong mach giAm -r A sai + Chgn A.

B Vi Z tlng n6n hp s6 c6ng su6t cria do4n m4ch gidm + B dfng,

C Khi Tach c6 c$ng hy*g s5 chi cia v6n t<ti ti ruong mfc giira hai ttAu dopn mach g6m tu diQn vi cuSn cim thuAn bing 0, khi tAn sti f thay OOi ttri st5 chi cia v6n kri tang + C rhing

D Khi cQng huong Zy= Zc, khi tdng f thi ZLtdng, Zg gi6m mi I gi6m -+ Uc : lZg gihm -+ D tlirng.

Cdu 20 6nh sdng don sic khi di tir kh6ng khi vio trong nu6c thi budc s6ng giim ?" : Mn = 0,61(413) =

0,45pm -+ khoing vdn i : ),'Dla: 0,45 rc4.21(0,5.10t') = l,8mm KhoAng c6ch gifra hai vdn sSng bflc

ba tr6n mdn bing 6i = 6.1,8 : l0,8mm -+ Chgn D.

CAu 21 ROto cria ttQng co kh6ng tl6ng bQ ba pha ld r6to lOng s6c chf kh6ng phdi ld nam chfrm diQn+ C

sai-+ Chon C

Cdu22 D6i trr,rc toa d0 X: x - I = 4cos(srlt+ rcl6) cm

Khi x: -l cm thi X = -2cm Trong gi6y diu ti€n s6 chu ki bing

llT : 110,4 = 2,5it&c li trong 2,5 chu ki dAu tli€m M quay duo c

2,5 vdng tvtSi vdng quay, di qua di€m N (c6 X: -2cm, theo

chiAu duong) I lAn, trong 2 chu ki M <li qua N .le 2 lAn, cdn l/2

chu ki nta thi M chua qua N, do v4y sti tAn v$t qua tli€m N chi ld 2 + Chqn A

Cdu 23 Trong mpch dao tlQne di€n tir tU do, vu 112 chu ki dao ttQng te tir ktri ddng diQn d4t cgc d4i, n6

lai ttat gi|tri cr,rc dpi n6n ning lugng tir trudng v6n d4t cgc d3i -+ ndng lugng cria mpch dao tlQng t4p trung d cuQn cAm + Chgn A.

Cdu 24 Tri thdng cUc Aai qua khung dAy bing Oo: NBS : 50.0,2 7,8J0-2 = 0,78(Wb) TAn s6 g6c cria

tir thdng bing t6c dQ g6c quay cia khung tD: 2nn = 8On(rad/s) -r biAu thirc cria tir th6ng qua khung

O : 0,78cos(80rt + n/6)Wb + sudt tliQn tlQng tr€n khung li e: - dQ/dt: 0,78.80nsin(80rt + n/6)Y :

l96cos(80nt - n/3) (V) -+ Chgn A

C6u 25 Theo thuy6t lugng trl c6c phdtdn c6 ning lugng e: hf -> c6c ph6t6n c6 tAn s6 kh6c nhau thi c6

n[ng lugng khdc nhau + B sai -+ Chgn B

Cdu26 DOng nlng crla mdi Olectron k*ri dlSn an6t li Wd: eUar: 1,6.10-re.12000: 1,92.10-r5J 56 Olectron tt6n an6t trong m6i gi6y ln n=lle= 20.10-3(1,6.10-re) = 1,25.1017h4t 56 electron d6n andttrong

20 phrit li N : n.20.60 = 1.5.1020 hat NhiQt lugng mi an6t nhgn duo.c li q : 90olNWd = g0%1,5J020J,92.10-rsJ = 2592001 :2s9,2 kJ -; Chgn B

CA.u 27 Trong c6c lo4i tia ph6ng xA thi tia gamma khdng mang diQn, cdn cdc tia cdn l4i mang tliQn tich

n€n tia y kh6c vdi cic tia cdn l4i -+ Chqn D

Cdu28 Tai t: 0 (diCm M tr6n duong tron)thi x: 0 -+ dQng nlng cfia vgt

dat cuc d4i vd th€ ndng bing 0 Khi l14 ddng ndng chuy6n thdnh th6 ndng

thi thd ndng bing ll4 cs n[ng + ll2kxz : ll4.(112)kA' -) x': A2l4 -+

x= -Al2 -+ khoAng thdi gian niy li khodng thoigian v{t tti tri M tttin N

tr€n dulng trdn t1,a51 : Tll2: (Znll0n)112: 1160s + Chgn A

Cdu29 Mdy bi6n 6p li m6t thi6t bi ding de Ui'5n aOi diQn 6p cria ddng di€n xoay chiAu vi giir nguydn tAn s6 c0a ddng diQn xoay chi€u n6n A sai + Chgn A

Cdu 30 Trong quang ph6 cfia nguyOn tft hidr6, b6n kinh cria quT dao c6 mftc ndng luqng kich thich thir

hai ld 1 ,44a, d6 le ban kinh cria quT d4o M c6 b6n kfnh 9ro-+ b6n kinh Bo bing rs: 1,44a/9 = 0,16a B6n

kinh cria qui dqo c6 mfc ndng lugng kfch thfch thf 4 (qui ttao O) bing 25rs :25.0,16a= 4a -+ Chqn C.

C0u 3 l Chc hgt t4o ra trong m6i phOng x4 li x6c dinh, con c6c hat t4o ra trong nhirng phdn h4ch kh6c nhau cria cDng m6t ddng vi ld khdng x6c dinh -+ C sai + Chgn C

CAu 32 Ban dAu m4ch cQng huong voi s6ng di€n tir c6 budc s6ng 60m -) Xr : c.2n [LC:60m (1).

Khi tdng C th€m 6pF thi budc s6ng )u2= c.2n.JTG+6pn= l20m (D LaV (2) chia cho (l) -+

(C+6pFyC=4-)C*6:4C-+C=2pF.KhigiimCdi lpFthi diQndungcdnlpFnghialiCgi6mdi

mQt nrla, cdn Cl2 Khi tdng L l0n 18 lAn vd diQn dung li Cl2 thl budc s6ng cQng huong ld

}4 : c.2n JISLC I 2 = 3(c.2n.JtC l= 3.60 = l80m + Chgn C

Cdu 33 ChiAu ctia vectcr v{n tdc thay d6i khi'vdt qua vi tri bi6n *r A sai

ChiAu cria vecto gia t6c thay d6i lJri vft qua vitrf vi tri c6n bing -+ B sai

ChiAu cria lyc ttdn hdi thay d6i khi v|t qua vi tri ld xo kh6ng bitin d4ng -+ D sai

ChiAu cria lgc k6o vO thay tl6i ktri vflt qua v!tri cAn bing vi lgc k6o vd lu6n huong vA vi trf cAn bing ->

C tlirng + Chgn C

Cdu 34 Di€m M nim trOn vdn cpc ti6u, gita M vi <tuong trung trgc c0a AB c6 2 viln cpc ti€u kh6c -+ M

nimtr€n vdn cpc ti€uvdi k=2-+ dz-dr =(2k+ l)M2=(2.2+ l)Llz=37,5-30= 7,5cm -+ 5]"12=

7,5cm-) l = 3cm -+ S6 Aiem

"u, aei ntrGu ntr6t tr0n ttopn itring Oai L trongkhoing gifra A va n iing phin nguy6n cta thuong s6 tt(UZ) cQng th€m L Ta c6 Ll(M2) = 17,25/1,5 = I 1,5 + 56 itiiim cgc tt4i nhiAu nh6t bing 12 -+ Chgn C

Cdu 35 Trdn thang s6ng diQn tir, thti t1r

_c6c brtc x4 theo sg tdng dAn cria tAn s6 lar Tia hdng ngopi, tia tri

ngopi, tia Ronghen, tia gamma -+ D dirng + Chgn D

C8u 36 fhdi luqng m4t trdi giim cdn mQt n&a, tuc li gi6m tli l030kg Theo cdng thirc Anhxtanh khdi lugng niy tuong ung vdi ndng luqng E : mc2 : 1030.(3.1 0t)t = 9.1046J -r Khoing thdi gian giam di phAn ndng lugng niy blng t = E/P =9.10461(3,8.1026) =2,386.1020s = 7,51.1012 nlm -+ Chgn B

CAu 37 TAn s6 nh6 nhdt cria 6nh sang kich thich d€ €lectron bft kh6i bA ryt kim loai ld 6 : Aftr = 4,8.1,6.10-rerc,626.10'3a = l,l6.l0r5 Hz-+ EiAu ki€n d6 €lecrron bat kh6i,bd m{t tAm bac li

f> l,l6.lOrsHz-+ Chgn A

Cdu 38 Trong hiQn tuqng c$ng huong dao il$ng co, bi6n tlQ dao dQng cu0ng btic tlSt cgc dgi mi tOc AO

ti0u hao ning lugng do ma s6t beng t6c dQ cung c6p ning lugng cho h-6.(SGKVLI2) -+ B sai + Chgn B Cdu 39 Khi ttiQn 6p hiQu dqng hai dAu cuQn cim dpt gia tri cyc tlqi thi tlign 6p hai <tAu tto4n mgch gtim

<liQn trd vi tr,r ttiQn ntii titip l$ch pha vdi iliQn 6p hai ttAu do4n mach ld 900 -+ ta c6 gian dd vecto

nhu hinh v6 Tir giAn ttd vecto -+ Unc = Jq:fi= ![20t -60' = oor6V;

coso = Unc/Ur = AOJi ttZO = .l-l tZ*> cr = nl6 + ug tr6 pha so vdi uns li

n/6 + nlz:2n13 -+ pha ban tliu cria iliQn 6p u6 bing nl4 -2n13: -5nll2 O

Ta c6 Us = Upscosn/6 = 60\6 Ji tZ= 90V -+ Bi6u thrtc cria ttiQn 6p hai dAu

tp ttiQn li -+ us :9}Jicos(l00nt - 5n/12)Y-+ Chgn C

Ciu 40' Tai nhfrng diiim tr6n vdn ctrc dpi ld chd vdng ggn l6i g?p vdng ggn tOi -+ a dring -+ Chgn A.

T4i nhfng ditim tr€n vdn clrc dpi cfrng li ch5 uong gqn l6m g?p vdng gon l6m -+ B sai

Tgi nhirng diiim kh6c nhau tr€n vdn cr.rc dai n6i

"nrng pha ld kh6c nhau + c sai

' T4i nhtrng di0m kh6c nhau tr€n vdn cr,rc ttpi vi vAn cr,rcti6u n6i chung pha li kh6c nhau -+ D sai

Ciu 4l tchi duu <t6ng ho qu6 l6c tir m4t d6t l€rtniri ruo ooor thi;dg'hd iiv rrrar ai rai nliy aem ra

l,l l8s -+ Ta c6 86400 [o(t" - ta)/2 + h/R] = [,it8 -+ 86400 [2.10-:(h -t^i2 + 0,616400] I i,ilg ->

0,864(tn-to)+8,1 =l,ll8-+(t"-td)o-80c+nhiQtd00mata6t(ta)lonhonnhi6t<lgtr€nniri(tn)li

8oC -+ Chgn C

C6:ll 42 Tia s6ng d6 truyAn trong thuj' tinh c6 budc s6ng tit 0,64/1,6 = 0,4pm dln A,7611,6 : 0,471pm -+

trong thui'tinh tia sdng dd c6 budc s6ng tir 0,4pm ddn A,4751tm Tia sring ving truyAn ftong ch6n kh6ng

c6 budc song tir 0,57pm d6n 0,6pm Tia s6ng tim truyAn trong nudc c6 budc s6ng tt 0,4 4l(4/3) =

0,33pm diSn 0,38/(413):0,285pm + trong nu6c tia s6ng tim c6 bu6c s6ng tir 0,285prn"dtin 0,331rm So sdnh c6c k6t qui tr6n ta c6 l.v > ID > l.r -+ Chgn A (Thi sinh c6 thiS chgn fit n gia tri nio trong i<hodng cric budc s6ng vi thr,rc hiQn c6c phdp tfnh nhu trOn cfing dugc k6t qui cAn tim)

Ciu 43 Thi€n HA cria chfng ta c6 dulng kinh bing khodng 100000 nim 6nh s6ng (SGKVLI2)+ C dring -r Chgn C

Cdu 44 Sti hat nhdn !f Co c6 trong I 00g ban ttAu bing No = 100.6 ,022.102316A : 1,A0367 .t O2ahpt S6 trat B- ph6t ra trong thoi gian t ld No : Noe-r' :2,497.10t7; thay gi6 tri No vd t : I phrit -+ hing s6 ph6ng xg l,

=4,146.10-e(lA)-+ s6hatF-sinhratrong I n6m ldn =No-Noe-rt,vdi t= I nim

:iAS.z+.leOor-n: 1,23.1023 hat -+ Chgn B

CAu 45 Di6m M nim trdn AB c6ch trung dirlm O cria AB lA 2 cm -+ higu rluong di dz - d1:2.) =

4cm Vi hai ngudn A vi B ngugc pha nhau n6n bi€n clQ dao ttQng t4i mQt rliem udt ti ii A :l2acos[ n(dz -dr)/1 + nl2ll :l2.Zcosl4nll,2+ nl}ll= l4cos[l tnl61:2Jj" + Chgn C

CAu 46 A C6ng sudt tiOu thp clign cria do4n m4ch li t6ng cdng sudt ti€u thu tr0n c6c ctign tro thuAn +

A tlfing

B CuQn cim thuAn vi tp dign kh6ng tiOu thg cdng su6t + B rlirng

C Khi miic nOi tiiSp th6m vio m4ch m6t cuqn cam thuen hlV mOt tu iien thi t6ng r& thay AOi ung ho{c giem

tu! thugc gi|tr:i cincim khdng vi dung khang n€n c6ng sudt c0a doan mach c6 th6 ting ho4c giAm -+C rtung

D Khi mic ndi ti6p thOm vio m4ch mQt dien tro thuAn thi ilign trd ctia mach ting + tOn! trO ting -r

cuong clO hiqu dpng cria ddng tliQn qua mgch gidm -+ cdng sudt cria doqn m4ch cd th6 ting hoac giAm -+

D sai -+ Chgn D

Cdu47 DiQn 6phiQudpnghai dAudo4n mgch bingU = JUtr+(UL-Ur),: ofOd +1tZO-OOy: 60JiV.KhitAns6lif,ta c6ZylR:UlUn:120/60:2;Zc/R:tJclUn:60/60-l.Khitans6lefl2thi

Zt':ZJ2;Zc':2k-+ U1'/Up'=Zr-'lR=hJ2R= l-)UL':fJR' ;IJc'/[JR'= k'tR=2ZglR:2) Ug'=2Un].Tirc6ngthfrc(!lpl)2].(Ur'-Uc')2:Ut-(ul')'+(unf=u2-+2(Un')2=u2-r(Un')2:

U2/2= 602-+ tliQn dp hai dAu diQn trd bdy giobing Un':60V -+ Chon A

Cdu 48 A anh sdng tring li h6n hgp cria c6c rinh s6ng don sic c6 miu biiin thi6n li6n tgc tir tl6 d6n tim

chft kh6ng phii chirm s6ng g6m c6 biy tia s6ng <ton sic ttr miu dd d6n miu tim -r A sai

B Mqi rinh sring clon sec mi ta ntrin ttrdy ttAu co bu6c song trong khoang tu chrmg 0,38 pm d6n 0,76 pnr

tong ch,6n kh6ng, chf kh6ng phii trong bdt ki m6i truong nio -+ B sai

C Khi di tt m6i truong kim chi6t quang sang m6i truong chi6t quang hcm thi chi6t sudt t6ng -+ t6r AO truyAn s6ng gidm + budc s6ng c0a anh s6ng oon s6 giam ai -+ c itring Vfly chqn C

D Khi di tir m6i trudng trong su6t niy sang m6i trudng trong sudt khdc, tia sang c6 budc s6ng cang ldn thi chitit sudt c0a m6i trutmg aOi vCi tia s6ng cdng nhd + tia i6ng b! lQch cang 1l D sai

Cdu 49 Sau 2 nim mQt lugng ch6t ph6ng x3 gidm tti 4 lin, d6 ld kho6ng thoi gian bing 2 chu ki b6n rd

m = mo/23: m0/8, tr?c ld luqng ch6t ph6ng xq cdn lai l/8 lugng ban dAu + Chgn C

Cdu 50' A MAt trcri ph6t ra quang phO tien tuc vi d6 le kh6i khi c6 6p su6t lon n6ng s6ng ph6t ra -+

A d[ng

B Quang ph6 cfia m{t troi thu duoc o tnii ddt.li quang phd hdp thu vi 6nh sring m{t trdi khi di qua lop

khi quy€n mdt trcri bi lop ndy h6p rhs n€n thu dugc quang phd h6p thg + B drin!

C Quang pho trdp thu cria ch6t iong ld quang ptro dam, m5i Oam g6m nhi€u uaitr tt6p thp n6i tidn nhau m6t c6ch li6n tuc -+ C sai -r Chgn C

D MOt <tdn ph6ng ttiQn chria khf iodng n6n c6 5p su6t thAp, khi phdt s6ng sd phrlt ra quang ph6 vach phrlt x4 -+ D tiling

.Sa,*t6,v, v^f;J\&t't-,