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Trang 1xrtvr rRA I rrEr ivr0Nr v4r li Lop
^12
- NANc cAo NAnn Hec zltz -zot3.
DE2
1 Con lic ld xo g6m mQt vflt m Vd lb xo c6 dQ ctug k dao dQne diAu hda, khi mdc th65n vdo vft m mQt v6t
kh6c c6 kh6i luq;g g6p i fa" vflt m thi chrt kj dao dQng cria chung
A tdng l6n 3 ldn B giAm di 3 16n C tAng len 2 mn D gi6m di 2 lan
e tOng sO ddy cyc dai ld mQt s6 chdn L L - L
g.q6r[ o aay cuc ti6u ta m-Ot sore :'- L
C t6ng s6.day cyc d4r hay tdng s6 d6y clrc ti6u ludn ludn th mQt sO 16.
O tOrrg s6 Aiy cgc dai limQt sO 16 vet6ng sd ddy cgc ti6u li mQt ch[n.
3 S6ng t<$t trgn ld hai s6ng c6 '
A ctng tdn s6, cirng bi6n dQ B ctng ,?" tq vd dQ lQch pha kh6ng d6i theo thoi gian
C
".1"g bi6n dQ, cing pha D.Su"g t6n s6 vd d0 lQch pha thay d6i theo thdi gian
4 Ee c6 s6ng dime
",ey ra trOn mQt sqi d6y dhn trOi voi hai dAu d6y ddu ld nrit s6ng thi
A chiAu ddi ddy bEng mQt phq t" budc s6ng '
fi A
B bu6c s6ng lu6n lu6n dirng b[ng chi€u dni ddy l*= L I*
C chi6u dni d0y bdng mQt sti nguy6n l6n nria bu6c s6ng
D budc s6ng b6ng mQt s6le mn chiAu dli ddy
5 Klri c6 s6ng dimg trOn.day Ap thf gn
= S["q = b-+ l.
A sO nrit b[ng sO bgng nOu B cO dinh 'rt- )v'J
B s6 bung hon s6 nrit mQt dcm vi n6u B t.u do
C s6 nirt banE sO bqng n0u B t.u do OOtr D s6 bUng hcvn s6 nirt mQt don vf n6u B cO Ainn
6 Chgn c0u sai ?
A Dai lugng d{c trrmg cho dQ cao cria am le Frr.6.
B Ecvn vi cria cudrng d0 am le W/nt'.
C Mrlc culng dO am tfnh b6ng Ben (B) hay dAxiben (dB)
D Cudrng d0 em ld dAi lugng d{c trmg cho i10 to cta 6m
T.Tainguoi chi nghe dugc c6c 6m c6 tan s6 nim trong khoing
A t$r t6Hz 200OHz
c tir 16 KHz-20000 KHz
B tir l6Hz - 20000H2
D tii 20 KHz- 2000 K}{z
I Yr:ddy
dnn
"u "nte;.t7l,n aAu co dinh song dimg tren ddy c6 *r";:;fl jlTff t-=LL
9 Trong thf nghiQm giao thoa s6ng trOn m{t nudc, hai ngu6n k6t hqrp Sr , Sz dao dQng Ehu k} 0,2 s, t4i mQt
ai6m Vt cich Sr, Sz nhimg khoang dr=lLcm, dr=L3cm s6ngc6 bi6n d0 cUc ttai Gita M vd dudmg trung truc cira S1S2 kh6ng c6 ddy cgc d4r kh6c Vfln t6c truy6n s6ng tr0n m{t nudc 1} bao nhi6u ?
A y= 20cmls B v= 5cmls C v=tocmls D v=tO0cml s
L0 MQt dng si{o dai 80 cm, hd hai ddu, tAo ra mQt s6ng itrlng trong dng s6o vdi 6m li crfc ttai 6 hai ildu
dng, trong kho6ng gifra dng s6o c6 hai nrit s6ng Brrdc s6ng cria 6m ld
A l,=2Acm B.)u=40cm C.),=80cm D l"=160cm.
LL S6ng dimg tr6n d0y AB c6 chi6u aa$fZcm voi dAu B c6 Ainn Tan sO dao ttQng cira dEV lI.5OHz, vQn t6c
truy6nJngtrOndayh 4mts.Tr0nd0yc6.L l.=0,0Q L= l- t L=P
-$nrit;4 bung B.4 nrit;4 bung C 8 nrit; 8 bung '- D 9 nrit; 8 bftg
(12;tr/1Ot s6ng co hgc truytin dgc theo tryc Ox c6 phuong trinh a = 28cos(2ox - 2000t) (cm), troqg d6 x li to4
\dAo*tinhlangm6t(m),tldttroigiandugctinhUanggi6y(s).VantOcctras6ngli 4.334 m/s B 100m/s C 314mls D.331mls \/ ' - f =A - [,/Xlt-t - Jg fi
13 Voi mQt s6ng am, kfii mirc'cuong d0 em tdngth€m 20dB thi
""1ng gg i1n ta"g
-y_
M A bO mat mQt ch6t 16ng c6 hai ngudn ph6t s6ng t<6t trqi,p 51 vi 52 c6ch nhau 20cm Hai nguiin dao dOng
theo phucrng thdrg dimg c6 phucrng tdnh lan lq$ Le ur = 5cos4Oact (mm) vh uz = 5cos(40nt + n){mm) TOc
dQ truyAn s6ng trOn m4ichdil6ng ld 80cm/s SO diem dao dQng vcri bi6n ttQ qUc d4i tr€n doan thang SrSz ld
A 11 8.9 -y= C 10 f ;0,0( D.8 l={
15 Hai con 18c dcm c6 chu ki Hn luqt li T1 = 1,5s vd T2:2s dao dQng nh6 trong'hai m{t phAng song song
Hai con lic ctng qua vi tri cdn b6ng theo cDng chi6u hic t: 0 X6c dinh thdi di€m gan nn6t ma hiQn tuqng
tr0n t6i diOn?
16 MOt vflt dlo dQng diAu hba vcvi bi6n d0 A Khi li d0 x - A/3 thi
A th6 n[ng bane '1li
dQng ndng B th6 ndng b6ng 3 <lQng ndng
C the nang Ueng 1/8 dQng neng D the ning bdng 9 ttQng n5ng
Trang 2L7 MOt chet di6m dao dQne di6u hda thUc T*= 3h
hiQn 2A dao dQng trong 60s
I
q-r
Ch9n40c thcvi
t
-t
\\ t1
.t li- t t9
glanla luc Cnat , A, Olem , 4 o.o
L9 MOt vQt dao dQng di6u hdzi c6 dO 16m vfln tdc cyc d4i li,3l,4cm/s L5y n =3,14 f6c d0 !ry+S binh cria
,A^p0cm/s B 10cm/s c 0 V+;= G - -ryItt"illr 7p .f
,@lWEt con l6c don g6m qu6 cAu c6.kh6i luqmg m treo vio m$t sqi d6! c6 chidu'dei l Tt vf @.can b5.tg,
IruyAn cho qu6 n4ng vfln t6,c-2mls.Ley e: 10m/s2 DQ cao lcm nhat mi quq n{ng d4t {ygc so voi yi tri c6n bang le Y"Fr:A ul I - Uj\$6 [-l n = L (r wrn^'a w
A.Zm B.0,8m.?- P c.zo"hcm." I i*;.20"#
=+-21 Trong ctng mQt thoi gian, con 18c dcrn tfrri Lfr6t thyc hiQn {uqc 10 dao dQng, cop 16c <Iqp th,i hai thgc.
hiQnducy.c2}daoAQ"e.risOchiAudlictrachirngli [, 1.* k = [9t I:l
A rr:r g.!r=L c.b=2 , ' , loz " o.W]+ $r JyL' lbu
l, 2 l, 4 l, l t- - il,r_ L
22.Dao ttQng t6ng hgp cria hai dao t1Qng di6u hda ctng phucmg, cung tffis6 c6 phucmg trinh
x = 3cos( * - 4> (cm) Bitit dao dQng thri nh6t c6 phucmg trinh x1 = 5cos(rt * 1> (cm) Dao dQng thrl hai c6 o,u, uu ruunnuo* duu rn *-@ -}F = AL + tr f J* fs ,rs
A -'-" - 8.cm vi - 6 - { rad B 2 cm vd 6 - Lrad C.2 cmui - 5T 6 ,u6 D 8 cm ui, - Yrua6
23 Hil dao dQng di0u hda ctng phuong, Cung tan s6, ctng bi6n d0, c6 d0 lQch pha ld n/3 Dao d$ng t6ng
hqrpc6bi6nt1Q^ldl0Jrcm.Bi6ndQctram6idaodQngthlnhpnantn A( : Ut-*tJt = -lI
"*:
24 Phuong trinh vQn tiSc cira mQt vQt dao <tQng diAu hda: v = A acosrrtlt I(5t luan ndLo sau ddy ld thing?
A G6c thdi eian li hic ch6t di6m di qua vi tri cdn bdng theo chiAu ducmg
B Gdc thoi gian li hic ch6t di€m c6 tga dQ x : -[
C Gi5c thdi gian li hic ctrAt AiOm c6 tga dQ x : A.
D GOc thcri gian 1I hic chdt di6m c6 tga d0 x : A, ho{c x : - A
zi.Tqlctng mQt vi tri tlia lf, ntiu chiAu d^di con l[c dcm tdng4 tan tfri chu k] dao dQng di6u hol cira n6
A tSng 2 lAn B gifim 4ldn. C gi6m Zlen D t6n g 41An
26.XetmQt vft dao dQng di6u hoh v<yi biOn dO A, tan sO g6c a Tai vi tri c6 li d0 x v{t c6 vfln t6c v H0
thrlc nio sau ddy ld kh6ng dung ?
*f = a'(N - *') B Az-={'t* C a.2 - A'-*' D o)'=
@ru^irQ crra 0"" uo,*,a,noG4#SHH.:Ctffir/;"ti* dao d6ng thanh phdn c6
A Aq = (2n+l)n B AE = (.2n +.1)r,// C Aq =Znlt D A<p =
28 Khi tan sO dao dQng ctra ngo4i lgc b6ng tan s5 dao <lQng riOng cria hQ dao dQne thi
#-<-NAng luqng dao <lQng kh6ng d6i D Bi6n t10 dao dQlg dat crrqdai
f@)vt1T
""" rt il;ffi rqi iuy c6 chieu ddi 0,1m vi qui n{ng c6 kh5ii"qnglOe -*g diQn tich 10 -7C
dao dQng trong.diQn trucrng iIAu vecto cudng <10 <liQn trucrng E c6 phucrre thAtg dimg hudng xu5ng,
E = 104V/m.lAy e: 10m/s2 Tinh chu ki dao dQng cira con l6c?
30.Motcontdcdcrrrciaod0ngdieuhoav6ichukiTt4ryg5
2
v
A'-x'
gi6 tri
0
I6n th
lrJr./ r(l,
A {,- 4n'g L= {- 6
B [-*
I-
(
T2
D 0,375 s