Ph6t bi6u nao sau d?y khdng dung trrhin6i v€ diQn tu tucrng?. A Ngutaim61noi c6mQttu-ruongUithttri0nttrmttroi gianthitainoid6xuthiqnmQtdiQnnrrongxo6y.[r]
(1)TRI/ONGDAIHQC SLrPH^F,' UATV*I
ilE TF{E THtr SAE FTQC (LAN 3) - Zg12
TRIIGNGTItrTCHUvBmDHSp o-^-:-.^^,-:-;-*
M6 d6 : 131 MON VAT LI {rnoi gian 90 phrit)
I.PHAN CHUNG CHO rar cA cAc rni SINH (40 c6u; r* cau tr6n cau 40)
CSu Cho h0 ld xo nhu hinh v6: m = 100 gt kr = 100 N/m;kz = 150 N/m Khi o vi tri c6n bing, t6ng
dQ gi6n ctra hai ld xo ld 10 cm K6o vdt toivitrid€ ld xo kh6ng gidn r6i bu6ng nhg dC vdt dao d6ng di€u hda co nlng cria hQ vh luc dln hOi cuc d4i cira lb xo I lAn luqt l} ,:.i, :\
' \qqg;i!:'r,like
Lddr"o-toiw*r.*l:l _-vrNH r8oNc sAN Ki ric xi ME I r : -/
T -.&lkr'3t-r**ll"EJ l{\
X
A 0,20 J; N 8.0,45 J; N C.0,20I;10 N D.0,40 J; 12 N
CduZ Khi mQt v6t dao dQng di6u hda thi
4 ,hc ndng vd dQng ndng vuong pha nhau B li dQ v) v6n t6c d6ng pha
9: li dQ vi gia t6c ngygc pha nhau D gia t6c vh v6n t6c nlugc pha CAu Chgn phdt bi6u sai vii dao dQng cudng bric?
A ia; so dao dQng cu&ng fl,i Uingia" rO cria ngoai lgc bi6n thidn ruAn hohn
B Bi6n dQ dao dQngcu0ng bric php thuQc vlo biOn dQ cria ngoai luc vh vlo dQ chenh l€ch
gita tAn s6 cua ngoai lUc vi tAn sO ileng cira h0
c Ei0u kiQn cgng humg h ten so cria ngoai luc bang tdn s6 riOng cria hQ
D.tsiOn dO auo aO"g cuong bric chi php thuQc lien AO ctra ngoai luc cu6ng br?c mi kh6ng
phg thuQc vio lgc ma sdt cria mdi trudng
CAu Chon ph6t bi0u kh6ng dring khi n6i vA s6ng Am?
A S6ng hm lh sr,r lan tnrydn.c6cdao dQng dm m6i truong
B S6ng 6m nghe dugc c6 tan sti nim trong khoirr tu 16 d€n 20 000 Hz
, C S6ng dm truydn*tdi didrnnbo qOitrulng:thi phan tu vft ch6tt4i d6S€ dao dQng rheo phuong vu6ng g6c vdi phucrng truy€n
D.Van tdc truyOn 6m phu thugc tinh din trOi va kh5i luong ri6ng cua mdi truhng
CAu Trung di6m o cria mQt day d6n diQn AB (A,B cd dinh) chTcu ai t.dat.trong m6itu trucrng dAu
sao cho c6c ducrng sric tir vu6ng g6c v6i sqi ddy Cho ddng di6n xoay chiAu t}n sO-SO Hz ch4y trlng sqi dAy dAn thi trOn ddy hinh thenh s6ng dirng iO O Uu"g sJng.'Toc di truycn s6ng tr6n day li Iz nt/s
Chi6u ddi cria sqi ddy AB le ' J
4.72 cm B 36 cm C.144 cm D 60 cm
CAu 6 MOt sgi ddy dln hoi r6t dei c6 dAu o dao dQng dieu hoh v6i phuong trinh:
uo= 1Osin2nft (mm) V0n t6c truyAn s5ng tr6n ddy ln 4 rnls Xdt di0m N rr6n dAy c6ch O ld 25 cm,
di€m ndy lu6n dao d6ng nguo'c pha vdi O Biet tAn sO f c6 gi6 tri ti 33 Hz d6n 43 Hz Bu6c s6ng cria s6ng trOn lh
A 9 cm B 10 cm C 11 cm D.12 cm
Cdu MQt do4n T?ch AB gOm di9n tro thuAn R = 50 Q mic nOi ti€p v6i m6t cu6n ddy kh6ng thuAn c6m Ddt vlLo hai dAu AB mQt diQn 6p xoay chiOu c6 gi6tr! hiQu Opng zOo V DiQn ap r"eu Juig glau
hai dAu di€n trO vb hai dAu cuOn dAy lAn lugt lb 100 V vn 100J2 V Ei€n trd r cira cuQn d6y lh
A 15O B 25A C" 30O D 50O.
C.Au S MOt thdu kinh h6i tg c5 hai mEt l6i cSbdnkinh gi6ng 20 cm Chi6t suft ctra thdu kinh
dOi vOi rinh s6ng vi tfm li na =1,50; nt=1,54 fni AO f<frJng c6ch tJ rie Jia*;5i;il; d6 ua,tu tim ld
A 1,48 cm 8.0,148 cm C 1,98 cm D.0,198 cm
(2)Cffu Mot doan m4ch gom diQn trs thuAn B = 50 Q rnic n6i tiep vdi tu diQn c6 di€n dting
10-o - nx+,.ao irui aAu do4n rn4ch mot dien 6p tt=200cos(100"t-flff) ' Bicu thirc cira
c= h.ilatvl
JI
diqn 6p giira hai dAu diQn trOla
i" ,o= 40.f5c'os (l00rt+1,249) (V)' B'uo=a0fiOro3(la\m -1'249) (v)'
C uo= 206cos (I00nt-3,463) (V)' D'.'o = 40"6cos (10}nt
*I'249)(V)'
CAu 10 MQt ducrng day dan mQt dbng diQn xoay chi6u c5 tAn s6 f = 5O Hz dt5n mQt
c6ng to di6n'
EiQn 6p hiQu dsng o r'ui aAu cong to dil;; mu"t u.",.vd bdng 200 v'
MQt cuQn allco
fe ;o ;one
suAt 0,8 dugc n6i sau c6ng to, trong S giO
"Ong,o "f i di$n ndng
tieu thg ld 8 kwh' DiQn tro thu6n vh
hQ s6 tU c6m cira cuQn ddY ld
A 16fl; 0,038 H B' 20fi.; 0'051 H' C:.12.?; 0'0-3-8 1{' Cdu 11 Chqn ph6t bi0u sai khi n6i v0 tia hOng ngo4i' Tia hOng ngoal
A c5 ban chdt ld s6ng diQn ttr'
*:!lJJi':;t#;Hi'TTf#"u'xuons i ra r.{erx W%
C do cdcvQtoinung n6ng ph6t n,tdci\ngn6i 9At P?i11f**9*'2:
^-"^c'ng 116:
B dugc img dung d6 tribgnh cdi
xucrng-H:ir',*k!-i;|H,il;;-,i#ffi,l-oil,-Eo u"o" s6ng r6n hcrn bu6c s6ng rffi s6ng do:
l"Z 0,76 pm r r | +^^^ *^^L A\T ,,b NTR n
cffu 12 D4t diQn 6p u u {2 cos aI vdo hai dau doan mach AB gam hai do4n mach AN vb NB m6c
noi tiep Do4n *uJ i* ;#;;6fir;"i;fu ;a;6p v6i cuQn Jam trruan c6 d0
ts cirm L, do*n NB
chi c6 tu dign v6i.diQn a,r!g c Khi diA; "f.r"n ,at ,o gO" at toi gi6tt\ at= o4 thi
diQn 6p hiQu dpng
gifra hai dau dopn m4ch eN thory phir thuQc R Dc dbng diQn doan m4ch cirng pha
v6i diQn 6p
gira hai d6u do4n *i.il AB thi pf,TiAiAu chinh tan sO g6cat6i gi6 tri
^ a4 B 4- c.zal u oal,.
^' Jt' 24u
, ,rrr.,r^ Loi ,{A,' ,{ hai doan m4ch AN vd
CAu 13 Ddt diQn 5p*, =200cos100 nt (Y) vho hai.dAu.doan m4ch AB gdm
"trig mic noi tiep Eoa" m.ch AN 96* ti6rr.rr& R nrlc noi ticp v6i-cuQn c6m thuan g9*90 tu cam.-! =_
159,15 mH Do4n m4ch NB g6m diQn tro thuan r = 10 Q m6c noi tiep v6i
t* diQn c6 diQn, june c
Khi thay a6i gra rn *
"u" oiSn trcy c6ng
,u6t t*u thq dign cira n6 dqt gtdtri cuc dai, ta thdy cong
,uAt
"1t" d4i nly
bing 100 W' DiQn dung C ctia tg diQn bing
A'.26,34 pF B'52,68 pF' C'45'39 pF' D'22'83
pF'
CA' L4 M6t lic lb xo d{t trdn mflt phang T* iF.Tg g6m ld xo nhe c6 mQt dAu gan c6 Ai*t' dAu gan voi vf,t nho * n_ a*lu, * gyy.!;i, ;-; tri airo iJui tten cm vir M- c6 krr6i ruong
bang mQr nrra v6r m- ndm s6t m Tha nhq m dc hai iarffid;d;;iln.,*s cua rr.u: lb xo Bo qua-msi ma s6t' o thoi di.m lb xo c6 i'6;;il;ff];" dau ti6n, kho tng c1chgita hai vQt m vh M ld
A.4,!g"*.- B' 3'18 cm'
-C' 5'39
"*' A'6'42 cm'
CAu x5 Mot con lac lb xo d{t tran m4t prr{e T*:s?ig gom 16 i: ge :6 99
cfms N/m vh vdt nh6
ktroi luqng a0 g HQ s6 mu s6t truqt gita v{iva mat phang ngang ri 0,1 Ban dau giir vat o vi tri lb xo bi gi6n 20 cm r6i buong nhg d0 r6c dao dong tit dan Lay g = 10 mls, T6c d0 rcrn nh6t vflt nho d4t dugc qu6 trinh dao dQng lh
A 90S cm/s' B' { cr'/s' C' 50JI cm/s' D' 90^'D cm/s'
{J
ciu 16 Trong c6c tinhchat vb img dpng sau, c5i nbo c6 o tia Rcrn-ghen' nhrmg
khong c6 o tia tu ngoai?
A Duoc dtng dc chira ung thu nong _8.96 kh6 n6ng ion h6a chat uri
C.T6cdunglOnkinhanh'D.C6tfucdungsinhli:diQtvikhudn.
T,IIFT CnrUV0N EHSP HA I\Qi -TFfi T'HLr DAI HqC laN S-(zOrZ) '
(3)C6u 17 M6t con la9 d9n fth5i luong hbn bi l) m) dao dOng diOu hon v6i tAn sO t t<tri rhay hdn bi bing hbn bi khr{c c6 kh6i lu.gng rn r =7m thi tAn s6 dao dQng lua con l6c do:r l}
4.2t. B f c ilz. D.Jtf
CAu 18 Mdt doqn nry"h
ie.gOm hai doan mach nh6 AM vh Nm mnc nOi tiep vcyi Doan mach AM g6m
diQn to R = 100 C) mac ndi tiep voi mQt qu diQn co diQn dung C = 3I;8[tF Doan mach MB g6m cuQn aay co AO
tu cam L vi diQn to thu6n r Khi ddt vio hai Aau nB m0t dign dp xoay chi€u thi diQn rdp rgc tho.i gita hai dau Aoen
mach AivI c6 bi6u thirc: u^, = 80J7cos(100?rr) (V) ; con diQn 6p ruc tho'i giira hai dau doqn m4ch MB c6 bi6u thtic: u", = 200cos(100 n * !l(V) Diqn fto tlruen vb dQ tu cam cua cuQn d6y c6 916 fi bdng
12' ',
A.r= n5 A;L=0,689H. B r = 153,5 C, : L= 0,281 H
4.0,095 H 8.0,120 H c.0,165 H D.0,191 H
C.r=216,5 C);L=0,398H D.r= 100 C);L=0,550H.
CAu 19 Chgn ph6t biOu
Ti khi n6i vd quang ph6 v4ch ph6t x4?
2 .A Quang pll6 yach phdt xa cliua cdc nguyOn t6 khric thi rdt khric vd: s6 lucrng vach ph6, vi trf vach, mdu sEc vi d0 s6ng ti dOi gifta c6c v4ctr
- B: Quang'ph6 v4ch ph6t xa duoc trrrg dung 06.ntran biiit sp c6 mdt cua mdt nguyOn t6
cdc h6n hqp hay mQr hqp chAt, x6c dinh rry4 phdn c6u eo.cria vflr
.C.Quang ph6 v4ch ph6t xa ld quang ph6 gdm mOt h€ thdng c6c vach mdu ri€ng 16 nim tr6n
m6t n6n t6i
r -D Quang ph6 v4ch ph6t x4 do cde ch6t khf hay hcri phdt rakhi bi kfch thich bing nhiQt hay
bdng diQn
CAu 20 M4ch diQn xoay chidu gOm diQn tro Uruan n mic n6i ti6p voi cuQn ddy Ddt vio hai dAu mach mQt
+!^ ' "r
=l20J6cos(1004r)CV) DbngdiQntrongm4chc6 gi6{higudpng liL2Addngthoi
ql9n ap xoay Qtueu u
lQch pha ! 6'3so vau vI lQch phu 1 so voi ud Do r.u cam cria cuQn ddy cd gi6 tri
Cia 21 MQt s6ng dm biOn d0 0,12 mm c6 cucrng dO am t4r mQt diem bang 1,80 w7m2 M6t s6ng Am
kh6c c6 cung tan so.glrung bion dQ bdng0,36 mm thi s6 c6 cucrng dg am tai diSu d6ld A.0,60 w/m" B.z,7}W/mz C.5A0Wim2.' -' Ii.l6,z0w/m2.
Ciu22 MQt 6ng kh( c6 mQt dAu bit kin, mQt dAu ho tao dm co bdn c6 tdn so ttzHz Bi€t t6c d6 truy€n dm khdng khf ld 336 mls Budc s6ng dbi nh6t ctra c6c hoa dm mb 5ng ndy t4o bing
A 3 m B 1 m C 1,5 m D 0,33 m
C6u 23 Do?n mach AB gdm mQt diQn micn6i ti6p vdi mQt cuQn ddy kh6ng thuAn cAm Ddt vdo hai dAu AB mQt diQn 6p xtay chi6u thi diQn 6p hiQu dlrng gifia hai dAu tu Aien ua Atqn dp hi6u dung gifta hai dAu cu6n day i6 gi6trinhu nhau Dbng diQn m4ch lQch pha so v6i diQn 6p gina hai-dAu doan mach mQt g6c bing "12! Hp sO c6ng su6t cira cu6n d6y l)
A 0,96 B 0,97 c 0,50 D.0,707.
Cfru24 T4i mQt noi c6 hai l6c don dang dao dQng vdi c6c bi6n dg nh6 Trong cring m6t khodng
thdi gian, ngudi ta thdy lic thri nhAt thpc hiQn dugc dao ddng, llc thri hai thgc hiQn duoc
dao d6ng T6ng chidu dbi cria dOy treo hai lac l) 82 cm Chi6u dii cta m6i con l6c lAn lucrr li
A li= 32 cm: lz = 50 cm
C lr - 0,50 m; lz=0,32m.
B Ir - 64 cm: lz=18 cm
D 11= 18 cm; lz= 64 cm
CAu 25 Ph6t biou nio sau d6y dring khi n5i v,5 dao ddng cria mQt l6c don truong hqp bo
qua luc cdn cira m6i trudng?
A Khi vdt n{ng o vi tri bi6n, co ndng cfa con l6c bing thc ndng cira n6
B chuytln clQng cua l6c ff vi tri bi€n v€ v! trf c6n bing ln .tt0* aA" C Dao dQng cria l6c l) dao dQng di6u hda
(4)Cdu Zd Tp diQn cla m4ch dao dOng LC lb tU dien phing Mach cd tAn bO Oao dQng liOng lb f Khi
khoing cdch giira hai bAn tu giim di lAn thi tAn s5 duo dQng riOng f i)
A E -NC
T\"L_LL B" f'= l.
2
t
,t
A f '
E_" I = -"
1
+
Fj" f'=4f
Cdu27 " Ph6t bi0u n)o sau ddy ld khdng dring? ' ;-'
t +tfu diQn ti ( tAng khi quyei.o dI cao tt 50 km - 800 km chria nhiAu hat mang di0n:cdc electron vh c6c ion) phAn x4cdc s6ng ng[n.
B" TAng diQn li kh6ng hAp thu hoflc phAn xqcdc s6ng cuc ngdn'
C Barrd€m tAng diQn li phAn xa tdl e5c s6ng trung nen chring truydn dugc xa Ban dOm nghe dhi bdng s6ng trung rd hon ban ngiY
b SOng Aai A5 dhng di oSng quu cdc vgt cdn ndn dnng dC thdng tin li€n l4c o nhirng khoAng
c6ch lcrn trOn mit dAt
CAu 28 Hai dao dqng diAu hba cing phuong, ctng tAn s5: xr= 4cos(cot ' + ]).* vd
12'
x, = 4sin(rot+ ft ) crn Bi0u thric cua dao dQng t6ng hgp: x = \* x, ld
4'
A x=4cos(cot- '4 t).*. C x=4f2dos(c,rt *
fi>r^.
B x=4rf2cos(r,rt -
]1"^
D x=4cos(rot *
fr>"*.
Cdu 29 MOt conJic don duo c treo vho trdn mOt thang m6y I{ii t}rang mdy dimg yOn t}ri chu ki dao dQng
diAu hba cua lic 1h 2,8 s ICri thang mdy chuy6n dQng *rang drmg di 16n nhanh dan deu voi gia tdc c6
dO lon a thi chu ki dao dQng diAu hda cua lEc 1d,2,4 s Khi thang m6y chuyOn dQng *rdng dung di l6n
ch6m ddn dAu voi gia tdc cfing c6 dg l6n a thi chu ki dao dQng diAu hba cira lic li
A 3,8 s 8.3,5 s C.3,2 s D.3,6 s Cf,u 30 Ph6t bieu qho sau ddy ln kh6ng dringikhi n6i vC d6ng-ccr kh6ng"d6ng b0 ph.a?
A EQng co khdng d$ng bQ ho4t dQng dga trOn hiQn tugng c6m img diQn tu vb b6ng c6ch sir dgng tir trudng quay
B RO to cira dQng co quay v6i vfln tdc g6c nho hcrn vfln t6c g6c cira.tri trudng 9Yuy
C Tir trubng quay dugc t?o bing c6ch cho dbng diQn xoay chiOu c6 cirng tdn s0 chay vdo cuQn ddy tr6n stato cta dQng co
' n OOng co diQn bii5n d6i diQn ndng ccr ndng'
Cau Sf pattiE" ap xoay chidu c6 gi|tri hiQu dule U kh6ng AOi va tAn sO f thay dOi duqc vbo hai
dAu dopn mach'R1-b *a" trOi tiep OiCu chinh f d€n gi6 tri f1 ho[c fz thi diqn 6p hiQu dolq.g1Y,u h1i"
bin ru dign c6 gidtrlbing nhau pO Aien 6p hiQu dpng giira hai ban tu diQn cuc dai thi phii diOu chinh
tan sO f t6i gi5 trf
A.f'=2(f,'+f:) B.f'=)tfi+f:) ,.?=+.+ D
#=
CAu 32 Ph6t bi6u nao sau d?y khdng dung trrhin6i v€ diQn tu tucrng?
A Ngutaim61noi c6mQttu-ruongUithttri0nttrmttroi gianthitainoid6xuthiqnmQtdiQnnrrongxo6y
B N6u 141 m6t noi co mQt dipn truong kh6ng d6u thi tai noi d6 xuAt hiQn mQt trr tuong xo6y
C Diqn fftrong vd ttr trucmg ia n* rnfi ttt6 hiQn $rfc nhau cua mQt loai tuong nhdt gqi h dign ttr truong D Die,n nr mrvng *."it ttl-Cn x*g +ranh mQt clr6 co tia ltra dign'
CAu 33 MOt iu diQn C =lpF ddtichdiQn dugc mic v6i mQt cuQn diy L=lmH th6ng qua m6t kho6 K
T.i thoi di6m t = 0 ngucyi ta d6ng kho6 K Ldy trt = 10 Thoi gianngin nnat tt hic d6ng khod K cho d0n khi nlng lucrng d4n trucrng trdn tu bdng ndng lugng tu truo1rg trOn cuQn day i1 ,
A 33,3.10-ss -8 0,25.10-% c.16,7.10-8s' D 0,25'10-/s
TItrT cHUyEN Erdsp uA Ngl -THI THU DAI Hqc LAN 3-(2012) - M6n vAt lt - Me de 131- Page of 11
_
(5)CAu 34 Dao d6ng diQn tu trong mach LC le dao dQng di6u hoh I(fri irieu dien the gifia hai dAu cuQn
cAm lb !,2V thi culng dO dbng di6n mpch bdng.I.,8 mA Cdn khi hiQu diQn thd giira hai dau
cuQn cdm le 0,9 V thi cudng dQ ddng diQn m4ch bdng 2,4 mA Biet d0 tu cAm cua cudn ddy L =
5 mH DiQn dung cta tu diQn vb nanE tuqng diQn tir cua m4ch tuorlg irng bing A.zAnF vh z,ZS.t}'e J B 200 nF v) 2,25.1A;? J
c.20nF vh 2,25.L0-s J D.22,5 nF vd 2,50.10-8 J
CSu 35 Trong thi nghiQm i-Ang vA giao thoa 6nh s6ng, khe hgp S ph6t ddng.thdi ba bfic x4 dcrn sic
c6 bu6c s6ng 1.,= 0,40 pm ,Iz= 0,60 pm vi Xt= 0,J2 pm TrOn mbn, khodng gifta hai v0n sdng li€n ti€p c6 mhu gi6ng mbu vdn trung tdm, h6u hai vAn s6ng cua hai bric x4 trung chi tfnh ld mQt
v0n sdng thi sO vdn s6ng quan s6t dugc lb
A 13 vln. B 15 vdn C 17 vAn D 19-vAn
CAu 36 Trong thi nghiQm IAng v0 giao thoa 6nh s6ng, ngudin s6ng ph6t ddng thoi hai bric x4 dcrn sic,
c6 bu6c sOngien luqt li 720 rrnvi 450 nm H6i trOn min quan s6t, giiia hai vdn sSng gAn nh6t
vi ctng mhu v6i vdn s6ng trung t6m, c6 bao nhi6u vSn sdng kh6c mdu vdn trung tdm?
A 11 8.12. c 13 D 10
CAu 37 Trong th( nghiQm Idng vA giao thoa 6nh s6ng, tei di€m trOn mln cdchvin.hi+ gtfta 5,4.mm c6 v6n t6i ttrri"S tinhlt vdn ctrintr gitu Aofr sdng dcrn sdc ding trong thi nghiQm c6 tAn s6 5.10t4 Hr.
Khoing cdch tri min quan s6t dOn hai khe ld D = 2,4 m Khoang c6ch gifra hai khe li
A 1,00 mm B 1,10 mm C 1,20 mm ' D 1,30 mm
CAu 38 Trong thi nghiQm I-Ang vO giao thoa 6nh sdng, khoang cieh giltahai khe le 0,3 mm KhoAng c6ch gita mflt phang-chua hai fiie vI man quan sdt le 1,5 m Hai k:]re 31 ,S2, dugc chi6u ddng thoi bcri
ba bric x4 dcrn sic c6 bu6c s6ng tan tuqt lh: 1", = 0,4 pm ,Lz= 0,5 pm vb X: = 0,6 pm KhoAn g cdch
ngan nf,Aigifra hai vdn s6ng cing mbu dugc trOn mln ld
A.2,0 mm B 2,5 mm C 3,0 mm D 30 mm
Cdu 39 MQt brlc x4 dcrn sic c6 budc s6ng thiry tinh ld 0,2800 trtm; chi€t su6t cua thuy tinh ddi v6i bfc xa d6 le 1,5 Bric x4
"ry 14
' -A: tia tri ngo4i B tia h6ng ngo4i. CAu 40 Chgn ph6t biOu sai?
A
Quang ph6 liOn tpc chi phg thuQc vdo nhiQt dQ cria ngudn sang vb dugc img dgng d0 nhiQt dQ cria ngudn s6ng
B Quang ph6 v4ch hap thp vi ph5t x4 cria c6c nguyOn tO knac thi kh6c
C Nhimg v4ch t6i quang phO v4ch hdp thp cua mQt nguyOn tO nim dung vi tri nhirng v4ch
mdu quang phO vach ph6t x4
D.IIng dpng cira quang ptr6 nen tr;c dung ddxdcdinh thAnh phdn c6u tao cita nguiln sang
II PHAN nftNG: Vfdi ttri sinh chi ttuqc lim mQt trong hai phfin: phAn A ho[c ph6n B
A Theo chuone trinh Chufin ( 10 c6u tir cf,u 41 d6n cAu 50)
Cfru 41 Trong qu6 trinh dao dQng, chidu dli cta con lic ld xo treo thing dung bii5n thi6n ttr 30 cm
dOn 50 cm Khi lb xo c6 chi0u dei 40 cm thi
A tdc dQ cria vdt cuc d4i B pha dao dQng cua vdt bing 0
C lqc h6i phpc tdc dpng vdo vQt b[ng v6i lpc ddn h6i D gia t6c ctra vdt cuc d?i
Cda 42 D4t vdo hai dAu do4n m4ch c6 R, L, C mic nOi ti6p mQt diQn 6p u = UJI cos a.r t Cho bi€t
(J, =y vb C =
=]- Hg thrtc dring li6n hQ gifia c6c dai lugng R, L vd a; lh
^ ZLal'
B" R=L@. D n = 'f3ra
n" n=4.
{3 c R=T
(6)CSu 43 Eat dien 6p xoay chiAu c6 dn sO f thay d6i dugc viro hai dAu do4n mach gOm diQn c6 di6n
clung C vh di6n trd thuAn R mic nOi tiep Klii tAn sO la fr thi he s6 c6ng sudt ct a do4n mach li cosq,
Khi tan sd le fz = 3fr thi hQ sO c6ng su6t ctra doan mach id costp, = ficos.p, Gir{ tri cua c6c h€ s6
cdng suAt lh
^1
A cosrp, =
{r ro*pr= ? B costp,= J, "or*, = +
t1 f ,.orr,= , D cosrp, = 9,
"or*r=
@.
L.cosqr=-Z ,z , 4 4
Cdu 44 MQt ch6t di€m dao dQng di6u hda v6i phuffrg trinh: x = 6cos(20r + cp)(cm), d6 thdi
gian t dugc tinh bing giAy Khi ch6t diOm c6 li dO cm thi t6c d0 cira n6 li
A 8al2m/ s B 0,8J-2m/ s C 4}Jicml s D 80 cm/s
Cdu 45 Cho mach diQn nhu hinh v6 DiQn 6p gita hai
dAu do4n m4ch AB lA u = 200cos100n(V) BiiSt R =
100f2, cuQn day thu6n cttm c6 L = 318 mH, tu diQn c6
di€n dung C thay d6i dugc Thay dOi diQn dung C t6i giltri C = Co thi dien 6p hiQu dgng gita hai ban diQn
dat gi6 tri clrc dai Co c6 gi|tri bdng
LRC
ng r61pr -9ry.-{p s
A 31,8 pF B 15,9 pF C.23,9 ytF D 7,95 ptF
CAu 46 DO tri dao dQng diQn tir m4ch LC v6i tan sO dao dQng riOng cira n5, ngudi ta
A d{t vlo hai dAu do4n m4ch mQt dien 6p xoay chi6u
B d{t vdo*rai dAu do4n m4ch mQt dien 6p mQt chi6u
C cung c6p cho m4ch phdn ndng lugng bing phAn nlng lugng ddmdtsau m6i chu ki.
D tdng khA n6ng bric x4 s6ng diQn ttr cria m4ch
CAu 47.Vgt dao dQng diAu hoh v6i tAn s6 2,5H2 Khi vAt c6 li dQ L,2 cmthi dQng ndng cria n6 chitim
96Vo co ndng toin phdn cria dao dQng TOc d0 trung binh cua vAt dao dQng m6t chu ki lh
A 30 cm/s B 60 cmls * e.20 cm,/s, '-D Iz 9m4
Ciu 48 Chi€u AO"g tftOi f,ui bf*; dcm sic d6 vi lgc vho hai khe Young" TrOn mhn quan sdt hinh
dnh giao thoa, ta th6y hQ th6ng c6cvdn sdng c6 mhu
A d6 B h;c C d6,lgc, vhng D d6,lgc, tring.
Cdu 49 Trong mQt thi nghiQm, nguoi ta chii5u mQt chirm 6nh s6ng tr6ng song song hgp vio canh cua mQt ldng kinh c6 g6c chitit quang A= 8o theo phuong vuOng g6c v6i mAt phdng ph0n gir{c cria g6c chiOt quang DAt *Ot -an anh E song song vi c6ch mflt phdng phdn gir{c cua g6c chi6t quang 1m
Chi€t iu6t c,ia chAt ldm ldng kinh e6i vOi 6nh s6ng d6 le 1,61 vd d6i v6i 6nh s6ng tfm le 1,68 thi bA
rQng dii quang phd tr0n min E xAp xi bing
4.I,22 cm B 1,04 cm C.0,98 cm D.0,83 cm
CAu 50 Ph6t biOu nho sau ddy ln khdng dring? Cho c6c chim 5nh sr4ng sau : ff8ng, d6, vlng, tfm
A Anh sdng trfng bi tdn sic di qua lang kinh
B Chitiu 6nh sdng tring vho m6y quang ph6 sd thu ducvc quang phd liOn tgc
C Anh sdng tfm bi lQch vA phfa ddy l}rngkinh nhi€u nh6t chi6t su6t cria l6ng kinh d6i v6i
n6lcrn nh6t
D M6i chr)m anh sdng trOn ddu c6 mOt bu6c s6ng x6c dfnh B Theo chumrq trinh Nf,ne cao ( 10 cAu tir c6u 51 i[6n cAu 60)
C6u 51 B6nh de cua mQt dQng co, tri hic khoi dQng dOn khi d4t tdc dQ e6.c 100 radls, d6.quay duoc
g5c bing 200 rad Bitit b6nh dd quay nhanh dAn d6u Thoi gian tu hic bit dAu khoi dQng d€n khi b6nh db dat t6c d0 3000 vdng/phrit lh
A 120 s 8.6,28 s C L6,24 s D t2,56 s
(7)Cdu 53 Ph6t bi6u nho dudi dAy li sai?
A Khi yAtfinquay quanh m6t tryc ci5 dinh, mqi phAn tir cira vat rin dAu c6 gia tdc g6c bing
nhau nOn c6 momen qu6n tinh nhu
B Momen qur{n tfnh cua v6t rfn lu6n c6 tri st5 duong
C Momen quAn tinh cua v4t ran aOi v6i m6t tryc quay ddc tnmg cho.mfc quan tinh cria vdt d6 d6i vdi chuytin dQng quay quanh tryc
D Eon vi do rnomen qu6n tinh la kg.*'.
CAu 54 MQr v{r r6n quay quanh tryc c6 dinh theo phucrng tr\rlh rp=200+60t -2t2; trong d6 rp tfnh
rheo rad, cdn t tinh bing s G6c vft quay dugc tC tii tnOi di6m ban dAu cho dtin khi n6 drmg l4i lb
CAu 52 Ngudi ta xdc dinh r6c d0 cua mQt nguOn Am bing cdch sri dpng thi6t bi do.tAn sO am Kl'ti
;.^,i
nguon am cnuyerl odng thing d€u lpi gAn iniet bi dang dimg y6n thi thitit b! duqc tdn sd irn Ib,124
H7, cdn khi ngu6n dm-chuy€"n dqng th"ing ddu vdi cirng toc dg d6 xa thi6t bi thi thi€t bi.do dirgc tAn sO am le 606-ltz.Biet.rrguOn am ia rhielbi lu6n cirng nim tr€n mQt ducrng thing, tAn s0 cua nguOn
6m phdtra lh kh6ng AOI ve toc dQ truyAn 6m m6i trudng"bing 338 m/s T6c dO cira ngu0n im nhy (x6p xi) lb
luqng r6t nho thi
A diQn 6p hiQu dpng gifa hai bdn diQn kfiOng d6i
B" diQn 6p hiQu dung gita hai ddu diQn tro thuAn khdng d6i C diQn 6p hiQu dgng gifia hai bAn diQn tg t5ng
A.35 m/s 8.25 m C.40 m/s D 30 mls
A 450 rad B 650 rad C.1250 rad D 360 rad
CAu 55 Hai dia mong nim ngang c6 cing tryc quay thing dung di qua t6in cira chdng,c6 cing
mome! qu6n tinh AOi vOi tryc Dia thir nhAt dang quay v6i dQng qdng lb W, dTa thri hai ban dAu dang
dring y6n Thd nhq dia 2 xu6ng'dia.l, sau m6t khoing thoi gian ngfn hai dia quay v6i cirng v0n t6c g6c EQng ndng quay cia hai dia l)
A W B.Wt2. c.2w. D.Wt4.
L.1,167. 8.0,857. c.0,814. D t,228
CAu 60 M4ch diQn RLC nOl tl0p dang xdy cdng hucmg N6u chi giim diQn dung cria tg diQn mQt Cdu 56 MOt vflt rin q,ray nhanh aan AAu quanh m6t tryc cO A!*r xuydn qua vft MQt di6m trOn vdt ran kh6ng nimtrOntryc quay c6
A gia t6c titip tuyOn hucrng vhq tdm qy $ao.
n gia t6c tiep tuyen ngug- chiAu v6i chiAu quay cta v4t r[n o m6i thoi di6m
C AO ton ciri gia tOc ti€p tuytin lu6n l6n hcrn d0 l6n cua gia t6c hudng t6m
D gia t6cti€piop" kn6ng dOi, giu t6c hucrng tdm t[ng dfi*-*''- -'
CAu 57 M-6t tacvainc6 kh6i toqE m=Zkg, momen quan tinfr I.= 0,3 kg.-' , dao dQng nho t4i
a
nol co gra roc rrgng trulng g = 9,8 m/s2, xung quanh mQt tryc quay nim ngang v6i chu ki dao dQng
2,00 s Khoing c6ch tir ffUc quay d€n trqng tdm cria l6c li
A 15,1 cm 8.20,2 cm C.23,4 cm D 18,2 cm
Ciu 58 Ph6t biOu nbo sau diy le kh6ng dung khi n6i vA mO men dQng lucr-ng cua vflt rin quay quanh
mQt tryc cO einfrf
A Dcrn vi do momen dQng tuqng ld kgm2/s
B Momen dQng lugng cria vft rdn ti 16 vdi vfn t6c g6c cria n6
C N$u t6ng c6I vectJ luc t6c dung lOn v4t rnn bing kh6ng thi momen dQng luo-ng cua vdt rin duoc bdo todn
D Momen dQng luqng lu6n cr)ng dAu v6i vAn tOc g6c
Cffu 59 MQt birc x4 don sfc c6 bu6c s6ng bing 4=A36/tm trong thuy tinh vd c6 bu6c sSng
bing,L2=0,4Zpm trong mdt chAt long Chi0t su6t ti ddi cua ch6t long so v6i thiry tinh (ung vdi bfc
xa d6) ld
D diqn 6p hiQu_dsn_g
:l:i_Y::ilil -'-' flt) 1TT:?#.,,'
(8)TR.{toNG TrrPT cHuYfN EHSP ruA xql =================================================
DAP AN Bn sru THtr EAI r{Qc MON v4,T Lf
LAn 3-2012 (neiry LL-3-2&12)
A
HOI
C U D
131
E DE
132
E
133
D EE
!34'
CAU H6I
D
13L
E E
L32
D E
L33
D E
34
E
1 C B D B 31 B B A B
2 C D A A a., B C. B B
3 D A D D JJ D D C A
4 C D D D 34 C C B B
5 A B B A 35 B A B C
6 B A B B 36 A C B B
7 B A D B 37 C C C D
8 A C C C 38 A A A D
9 D A A B 39 D B B C
t0 A!. D B A 40 D D B D
11 B D B C 41 A C C B
T2 A A B D 42 A C A A
13 D A C D 43 D B B C
t4 A D D C 44 B A B B
15 D" A A C 45 B c C A
L6 A C C C 46 C B A C
L7 B B C A 47 B D D C
1,8 C D A A 48 C B B D
L9 D B B B 49 C A C D
20 C C D C 50 D D D B
21 D C A A 51 D D D B
)1 B B C D 3Z D A B D
23 C D C A 53 A C C C
24 C B D C 54 A C B L
25 A C C A 55 B B A\ A
26 B D A D 56 D B D A
1r7 D C C D 57 A A D
D
t>
28 D D A A 58 C D A A
29 DU B D D 59 B D C D
C 60 C A A D