[r]
(1)KrEM TRA I TrET MOw: vAr Li Lop.r2 - nrANc cA^o" NAtvt Hec z0t2 -zals.
EE2
L Con 16c ld xo gOm rnQt v$t m vi ld xo c6 d0 cimg k dao dQng clidu hda, kl:i rnic thOrn vlo vflt m mQt vQt
khdc co khdi luqng giip lan vflt m thi chu k! dao dQng c'ia ch[rr6 ):: :
r
A tang 10n l6n B giam dr tAn C tiirig 16n I&n ' :,, D gi"im Ai ; tan
2 Troig giao thca s6ng co irqg iO1 hai ngu0n cl0ng pha tlii , t4i
C tO-"g sO.ady cgc d4i hay t6ng s6 ddy c;;c tiOu lu6n ludn lI m$t sd 16,
D t6ng sO d6y cuc dai ld mQt s6 16 vd t6ng s6 ddy cgc ti0u lh mQt, ehhn 3" S6ng t6t trqp li hai s6ng c6
+
"*! .a" 16, "t "g bi0n EO .rBsctng tdn s6 vi r10 lQch pha khdng d6i theo thoi gian e cryne bi6n d0, ctng pha D cing ten sQ vi d0 lQoh pha thay d6i theo thli gian DO
"6 *Orrg amg iay ra tr0n mQt sgi d6y dan frOi v<vi hai dAu ddy dAu ld nrit s6ng thi A chiAu dhi d0y bAng mQt phan tu bu6c s6ng
? b."."," s.o.1s.lrio.1ru"on {,n"g bang chiAu deitay.
C chi6u ddi d0y bAng mQ! sO nguyOl l6n nira budc s6ng
D bu6c s6ng bdng mQt s6 le len chiOu dli d6y
5 Khi c6 s6ng drmg tr0n d6y AB thi
A s0 nrit bing sO Uung n6u B cO Ainn
C sO nut bing sO bUng n6u B tp do
6 Chon cdu sai ?
A DAi lugng dflc tnmg cho dQ cao ctra 6m th tdn s0
B Ecrn v! cua cudrng d0 6m]e W/rrf
C Mirc culng dO a; tinh bing Ben (B) hay dAxiben (dB) D Cudrng dO dm ld dai lugng dflc tnmg ho.dQ to c{ra 6m
7 TairrguOi chi nghe dugc cuc 6m co tAn sO nim trong khoing ,,F
B sO bpng hcrn sO
D sO bpng hcrn s0
nirt mQt don vi n6u B tg do
nrit m$t don vi n6u B cO dinh
A 1i2 8.1,/4
9 Trong thf nghiQm giao thoa s6ng tr€n mflt nu6c, hai ngu6n t<Ct trgp Sr , Sz dao dQng chu k] 0,2 s, tgi mQt
ai0m Pf c6ch Sr, 52 nhirng khoing dr=lLcm, dz=13cm s6ng c6 bi6n dQ cpc d4i Gifia M vi duong trung
tr.uc ctra SrSz kh6ng c6 ddy cgc d4r kh6c V$n t6c truy€n s6ng trOn m{t nu6c 1}r bao nhi0u ?
A v-20cm/s B v-5cmls C v-lUcmls I) v-lAAcmls
L0 MQt dng s6o dai 80 cm, hd hai cldu, tao mQt s6ng drlng trong dng s6o vdi,6m li cr.rc d?i d hai ddu
dng, khoing gifra dng s6o c6 hai nft s6ng Brrdc s6ng cria 6m li
A.'7u=2Ocm B l,=40cm C l,=80cm D.i,=160cm.
11 S6ng dimg tr6n ddy AB c6 chidu dhi 32cm voi dAu,B cO ainfr fan sO dao d$ng cira ddy li 50H2, v{n ti5c
truydn s6ng trOn ddy ld 4mls TrCn ddy c6
A.5nft;4bpng B.4nrit;4bung, C.8 nrit;8bung D.9htit;8bung
12 }d}ts6ng co hgc truyOn dgc theo trVc Ox c6 phucmg trinh a = 28cos(20x - 20001) (im), trong d6 x ld to4
dQdu<l.ctint'_uangm6t(m),tldthdigiandugctinnuanggi6y(s).vantocctras6ng1d A 334 m/s B 100m/s C.3l4m/s. D 331m/s 13 Vdi mQt s6ng am, khi mirc'cudrng d0 em tdng th0m 20dB thi cucrng d0 6m t6ng
e, t00 16, n 1OOO len C 201an O ZOO ta.,
M A bA mat mQt ch6t 16ng c6 hai ngu6n ph6t s6ng t<6t trq,p Sr vi Sz cSch 20cm Hai ngu6n dao dQng
theo phucrng thdng dimg c6 phucrng trinfr mn luqt th ur = 5cos4Orct (mm) vh uz= 5cos(4Ozct + zu)(mm) T6c dQ tryyAn s6ng trOn m{ichAi long li 80cm/s Sd di€m dao dQng voi biOn d0 cqc dei tr6n do4n thang SrSz lh
A 11 8.9 c 10 D.8
1-5 Hai l6c dcrn c6 chu ki lAn luqt la Tt = 1,5s vh Tz:2s dao dQngnh6 trong hai m{t pha"g song'song
Hai l6c cing qua vi tri cdn bang theo cDng chiOu hic t: 0 X6c dinh thti AiCm gan nh6t ma hiQn tugng
tr6n t6i di0n?
A 6s
A tir l6Hz-2000H2
C tir 16 KHz-20000 KHz
S MQt dffy dhn c6 chi6u dai 1, hai"dAu
B 2,5s
i6 M$t v$t dao dQng ditu hda v,5i
A thCI ndng b[ng L/3 dQng n6ng
C th0 n[ng bing Ll} dQng ndng
B.,ttr 16Hz - 2000AHz D tir 20 KHz'- 2000 KHz
cO dinh S6ng dnng trdn d6y c6 brr**; s6ng dAi n1l6t ia
C 1 Ll .21.
C L,32s D 3,5s bi0ri ,J0 A Kf i li ,i0 n -= Ai} tiii
B the ndng bing 3 dQng ning.
(2)'i !i' t
17 MOt chAt diOm dao dQng di0u hOa thr;c hiQn VA dao dQng 60s Chsn,g{c thdi gian l} iiib6n6t Oi6m oang o vl rn Dren am Thdi gian ng6n ntrAt ctr6t di6m qua q tn co 11 de -rc = -* kC tir iric Uit eAu dao dQng
le
A 1,25s B 1s C 1,75s ,* D 1,5s
18 MOt 18c lb xo dao dQng diOu hda theo phu<mg thdng dimg voi t6c dQ ffic 20 rad/s Chi0u ddi lb xo o
vi tri cdn Uand la 10cm Tai vi tri x : 2cm qui n{ng c6 vdn t6c 4QJicmls ChiAu dei 16n nh6t ctra ld xo
-:
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q
A 8cm B.lZcm C 14cm
19 MOt vflt dao ilQng diOu hdd c6 dO ltu vfn t6c cgc dpi ld 31,4cmls
vflt mQt chu ki dao dQng li
A 20cm,/s B " 10cm/s.
20;="MQt t6c dryn g$m que cAu cd kh0i
truyAn cho qu6 nflng vfln tOc }m/s LSy g : b6ng lh
A.2m.
lLz L4
A B rg' cxn vh l- rud
6
?3 F{ai dao CQng di0u hda
liv tri co tii$n Sq th 10jA ctrri
D.6cm 'r'
Lily tf, -::3,!4 TOc d0 trung binh cria
C 0n D 15cm/s
lugrig rn treo vho mQt sgi d6y co chiAu dei 1 Tt vi tri cdn bing,
10rn/s' DO cao 16n ntr6t mh qua nfing dat dugc so vdi vi trf c6n
C }}Jlcm. D.20cm
,ng, lac dcrn thir hai thpc
21 Trong ctng mQt thcri gian, l6c don thrl nh6t thgc hiQn duo c
hiQn duo c 2$dao dQng Ti s6 chiAu dhi cira chring lh
,r,1 tr- r, L t
A.2-1 Z t'.:=- C.Z=Z
8.0,8m.
lL
I
D 2=4
I
u1
2
D a)z= '
Az -xZ 22.Dao ilQng tdng hgrp ctra hai dao dQng diAu hba cing phucmg, cirng tdn s6 c6 phu<mg trinh
x = 3cos(
"t +) (cm) gitit dao dQng thri nhAt co phucmg trinh x1 = Scos(rct * Z)(cm) Dao dQng thrl
hai'c6 bi6n d0 vd pha ban dAu lh
B 2 cm vit Lrad C.2 cm ui - 5o ,u4 D 8 cm ui - 5o ,u4 66:6
ctng phucntg, clng tdn s5, cing bi0n dQ, c6 ilQ l0ch pha lit n/3" Dao dSftg t6ng Bi€n C0 ctra m6i dao dQng thln-h phdn ld ' , ,
A 10^6 cm B 10cm c rolficm. D 10.E"*.
\z
24 Phucrng trinh vfln t6c cria m6J vft dao dQng tti6u hba: v = A a)cos rttt .l<et lu6n nio sau d6y ld rlrring?
a COc th<ri gian li tric chdt di6m di qua vi tri cdn bing theo chiAu ducnrg
e C6c thoi fian lh hic ch6t di6m cO tqa AO * : -a
a C Ciic thrii gian th hic ctr6t diem c6 tga dQ x : A.
p.C5cttOigi*lhhiccfr6tAiemc6tgadQy:Aho{cx: -A !
Zl.Tqicung-mQt vi trf rtia If, ntiuchi6u dli con ldc dcrn tdng 4o,hi chu kj, dao dQng di6u hod cira n6
A t[ng Z tan B gienia lan C giim2lAn r -'' .: r -') tdng l6n
/ zS.x{tmQt vft dao t1Qng Aieu noi vrvi biOn dO A, tan sdg6c at.Taivi fficE Ii d0 x vft J6 vOn t6c v HQ
thric nio sau ddy li khdng dung ?
A Yz = a)'{A' x2)
27.Bi€ntlQ cria dao dQng tOng'hqrp bang O #u dQ lQch pha cira hai dao dOng phAn c6 gi6*i A Arp - (2n+1)rc B Arp = (2n +1)nl2 C Acp -2nN D.Atp= 0 28 Khi tan,s6 dao d,Qne oua ngopi lpc bing tAn sO daq dQngri6ng cira hQ dao d$ne thi
C Ndng luqrrrg dao dQng kh6ng d6i D Bidn tIQ dao dQng dat cgc d4i
29 MOt l6c dcvn g6m sqi d6y c6 chiAu dli 0,1m vh qud n{ng c6 ttrOi tuqn&$q,mang diQn tichJ p* 7C
dao dQng diQn trucme$Au vecto cuirng ttQ tliQn truOmg E c6 phucmg thang dimg hucmg xdlg,
E = f0*V/m.Ldy g: 10m./s' Tinh chu ki dao dQng cria I[c?
'$ 0,625s B ls C.1,625s D.O,375s
30 MOt i6c dcrn dao dQng di6u hba vdi chu ki T t4i noi c6 gia t6c trgng trudmg.g: ChiAu,dai dty treo
i6c ls.'i 1 t
2 tZ
B Az - x, +b C 0)2:u i_j*_
A r-*
T2
n-2
\ '"" L8 , t, ::