de thi thu dh truong KHTN hay

<span class='text_page_counter'>(1)</span><div class='page_container' data-page=1>

Trudng THPT chuy1n KHTN, Egi hpc KHTN, DHQG Hd

N|i

Trangl/4

Bq

crAo

DUc

vA

oAo

r4o

nd

rsr

rHI]

DAI

HQC

IAN v

NAM 20tt -

20Lz

CAu 1:

O bd mat mQt ch6t l6ng c6 hai nguiin ph6t s6ng

kiit

hqp Sr vd Sz c6ch nhau 25 cm. Hai nguii'n

niy

dao dQng
theo phuong

thing

chmg c6 phuong

trinh

lan

lugt

ld ur

:4cos40nt

(mm) vd uz:4cos(4Od + n) (mm). T6c dQ truyAn

tongiren

tn"at

.tr6itong

la a0

crdFko

diem dadrt0ng

vdi

bi6n d0 cuc d4i tr6n clo4n

thing

SrS2 la

A.

10.

B

ll.

c.12.

D.

13.

Ciu

2:

Neu6n dm rli6m S phrit ra sting dm truy€n trong mdi trudng

ding

huong. C6 hai tli6m

A vd'B nim

tr0n nria
rtudng

thiig

xudt ph6t

tir

S.

86

qua sU h6p thU dm. Mrirc

culng

ttQ 6m

t4i

A

ld LA

:

40 dB,

tai B la

LB:

60

dB.

Mtc

cudng clQ dm tai trung di€m C cira

AB

ld

A.42,2

dB.

B.

45,2

dB.

c.46,5

dB.

D.

50d8.

CAu

i:

Ngu6n dm S ph6t

_l?

u-

"g

c6ng su6t

P:4n.10"

W

kh6ng

tt6i,

truyAn

ding

huong vA

mqi

phucrng. Cho

culng

dQ dm chuAn Io

=

l0-r2 Wm2. Di€m

M

c6ch nguiin S mQgrtoan

lm

c6 mric

culng

ttO 6m

li

A.

50

dB

B. 60

dB

cl70

dB

D'

80 dB

Ciu

4:

O mflt thoang cria mQt ch6t l6ng c6 hai ngu6n s6ng

ktithqp A

vd

B

crich nhau 20cm, dao clQng theo phuong

thing

drmg

vdi

phuong

trinh

ua

:2cos40nt

(mm) vd uB

=

2cos(40nt

+ n)

(m,m)..Bii5t t6c d0 truytin s6ng tr6n

m{t

ch6t lOng

ld

30 cm/s.

Xdt hinh

vudng

AMNB

thuQc

m{t

tho6ng chdt

l6ng.

SO

di€m

dao <lQng

vdi

bi€n tlQ

cpc

clai

tr€n do4n

BM

la

'''

TRt-PcyNG

THPT GHUYEN KHTN

---9,---Uc:

Uc-*.

H0

thilc

<lting ld :

A.

frf,

= fr2

.

B.

f2f3

=

fi2 .

ruON

THI

:

vAr

lY

Thdi

gian

ldm

bdi:90

phftt

C. f3fi =

f22.

Ma d6:772

D.21.

D.20

D.

f,

+

f,

=2f,

CAu 5: T4i

ditim S tr6n

m{t

nudc y6h tinh _.c6nguiin dao clQng di6u

hoi

theo phuong

thing

clung

vdi

tdn sii

t

ffri

d6 tr6n

mft

nudc hinh thanh hQ s6ng trdn ddng _1amS.

T4i

hai ctii3m M,

N

nim

cdch nhau 5cmirdn,duong thdng di
qua S lu6n

_{ao

dQng ngugc pha

vdiihau.

Bitit

t6c tlQ.truy€n s6ng tr€n mdt nudc

ld

80cm/s vd tAn s6 cria ngu6n dao
dgng thay

tloi

trong-khiang itr 48Hz d6n

64Hz.T6ns5

dao

itdngpfu

ngudn

Ii

A.

48H2.

B.54Hz.

C-,56H2.

D.64Hz.

CAu 6:

Hai ngudn s6ng tr0n mat nudc Ie Sr, 52 c6ch nhau S1S, ₌91, phi{t ra hai sSng c6 phuong

trinh

_{u, = asinolt}vd

A.

18.

'

B.

19.

c.24.

u, ₌acosor. S6ng khdng suy

giim.

Sd didm giao ddng vdi bi€n dQ cilc dai trdn doan S,S, lh

A.17

B. l8

c.

19

Cf,u 7:

Cho m4ch diQn xoay chiOu

RLC n5i tiiip (L

thudn

"?ry):9

tan sO

f

tnay OOI tlu-oc.

Khi f

:

f1 hay

f

:

f2 thi

mach c6 c'ing c6ng suAt,

khi

f

:

f3 thi mgch c6 cdng su6t cqc cl4i. HQ thric

dfng

ld :

A, frf,

=

f;

.

B.

f2f3 = fi2 .

c.

\fr=f:.

D.

fr+f,

=2f

Ciu

8:

Cho mach ctiQn xoay chi6u RLC nOi ti6p _@

thuin cim)

c6 tan sii

f

thay AOi dugc.

Khi

f

:

fi

thi

hieu di€n th6
tr6n ctiQn trd Up

:

UR-*, Uri f

:

f2

thi

hieu dipn th6 tr€n cugn cd'rn U1

:

IJL**, khi

f

:

f: thi

hiQu dien th6 tr€n t1r cliQn

Cflu

9:

M4ch xoay chi6u nOi ti€p g6m cuQn dAy thu6n

cim L,

diQn trd R

:

150.6

Q

vd tg dign C. Dat

vio

hai dAu

do4n m4ch hipu diqn th6 u

_=IJ

"cos2nft(V)

vdi

f thay d6i duo. c.

Khi

f =

fi

:

25

Hzltay

f

:

fz:

100 Hz thi cudng dQ

ddng diQn trong m4ch c5 giri

tr!

hiQu dgng nhu nhau nhung lQch pha nhau n

/3

. Cam khang cuQn ddy

khi

f

:

fr

ln:

^p.- 50

Q

B.

100

O

C.

150

O

D.200

O

eAu

10:

Con

lic

ld xo

c6 ttrOi

tugng

250 g, d0 cung

k:

100

N/m.

Con

lic

dao tlQng iti€u

hoi

vdi

bi€n d0

A

vd

khi

crich

vi tri

cdn beng 2 cm n6 c6 vfln

tiic

ld

40.\6 cds.

Gi6

tri

cria bi6n tlQ ld

A.2

cm

B.3

cm

C.4

cm

D.5

cm

Ciu

11:

Con l6c

ld

xo dao -lQng didu hoh tr€n doan

_{AB =}

10 cm vdi chu

ki

T

₌

1,5s. Thdi gian ngdn nhdt dd con
l6c

di

hdt qudng duhng 95 cm

li

A.6s

B.7s

C.8s

D..9s

CSu 12:

Con

lic

ld

xo dao dqng di€u hda theo phuong theng dung

vdi

tAn sii

f

:

2,5 Hz, trong qu6

trinh

dao ttQng
thi

t!

sti

gita

lqc ddn h6i cgc d4i

vi

cr,rc ti6u

li

3. Cho n2

=

10. Gi6 fi5c cg9 d4i

cta

dao dQng ld

a,.

i,s

,rjr'

B. 3

m/s2

c.

I

m/s2

D. 6 m/s2

Cflu

13:

Con l6c

ld

xo c6

khdi

luong m

₌

100 g, dao dQng didu Lod

vdi

co ndng E

₌

32

m!.

Tai

thdi

didm ban ddu
vdr c6 van rdc v

₌

40,.5

cm/s vd gia tdc a ₌8 m/s2. Pha ban dduBfrb dao dQng ld

</div>
<span class='text_page_counter'>(2)</span><div class='page_container' data-page=2>

Trudng THPT chwy€n KHTN, Dgi hgc KHTN, DHQG Hd

N|i

Trung2/4

Ciu

14:

Con l5c

ld

xo dao d6ng didu hoh

vdi

bi€n dO

A

=

2

cm,chu

ki

T

=

1,2s, pha ban ddu

lh

t

13. Qudngdudng

con

I6c tti dugc trong 4s ddu ti€n ld

4.26

cm

8.27

cm

C.28

cm

D.25

cm

CAu 15: Hai v4t

M

vd

N

*uat

pfrai

i1

g6c vd bat <tdu dao

tl$ng didu

hda theo

cirng

chiAu cria

trgc Ox.tr6n

hai

J.O"g iita"e ,ong

,ong

kii

s6t nhau

vdi cing

bi€n d0 nhung

vdi

hai chu

ki

lAn

lugt

ld

Tr

vd

T2:

2T 1.

Tf

si5 vAn t6c
khi chirng g4p nhau

li

A.

1/1

B,

zlt

c..4ll

D-

2/3

ciu

16:

Trong mQt dao dQng

dieu hoi

c6 chu lcy

T thi thdi

gian ngan nh6t d€

vft

cti

tir vi

tri

c6 c6 gia t6c cuc dai
d6n

vi tri

gia

tiic bing

mQt nria gia

tiic

cuc ctai

ld

,

A.Tltz

B.

T/8

c.'Tl6

D.Tl4

CAu 17:

MQt v6t dao itQng diAu hod:

khi

li

dO cria vdt

li

xr

:

-lcm thi

v4n t6c

cia

v0t

lir

vl

:

5Jin

cmls,khi

li

d9
crla vat

xr=

Jicm

thi

vin

tiic

cria v4t

or:

-

SJlncmls.

Bi6n rlQ dao ilQng cria

v{t

li

A.2crn

B.3cm

C.4

cm

D.5cm

Ciu

18:

Didu ndo sau dAy kh6ng dring

khi

n6i vd s6ng dirng

A. lfinh

6nh s6ng dttng lap lai sau

l/4

chu

kj'

s6ng.

B. C6c phdn

til

mOi

trulng

& hai b€n mEt

nft

dao dOng ngugg-pla

vdi

nhau'
C. C6c bidm nam gifia hai nrit li€n tidp dao d6ng

cing

pha

vdi

nhau'
D.

lfinh

lnh

s6ng dtmg lap l4i sau m6i nrla chu

k!'

s6ng.

Cflu

19:

Mach RLC ndi tidp gdm dien tr& R, cuQn cAm

(L,r)

vd tu diOn C.

Khi

hi€u diOn thd hai ddu doan mach ld u

=

65{2cosatt (V)

rhl cdc di€n dp hi€u dung trOn diOn tr6

vi

cuQn d6y ddu bang 13

V

cdn di0n 6p tr€n tu ld 65

V,

cOng sudt ti€u thu tr€n tolq'-mach

li

25

W.

Hq sd cdng sudt cfia

mach-li

A.ill3

B

s/13

c-

tolt3

CAu

20:

Trong doan mac[pRLC

ndi

tidp dang

xiy

ra c0ng huong. Tdng ddn tdn sd dbng di€n vd

giff

nguydn c6c
th6ng sd kh6c cfra mach, kdt luAn nho sau dAy dring

A.H{so

c6ng sudt cria doan mach

giim

B.Cuong dd hi0u dung cfra dbng diQn tang

C.Uieu aien ind hi€u dung tr6n tu dlcn

tang

D.HiOu di6n thd hiOu dung tr€n cuOn

cim

giAm

Cffu 21:

Mach RLC ndi tidp theo thrl tu gdm tu C, bidn tr& R. vd cu6n dAy thudn

cim

L.

Det vdo hai ddu mach hi€u
<ii€n thd ure ₌

tjocos(lggnt

-

xl3)

V.

Thay cldi R. ta thdy

khi

It

=.200f) thi

cu&ng dd ddng diOn-nhanh"pha hcn hi€u
di6n thd traiAau mach, P

₌

P.-

₌

100W vd Ur-as _{= 200V}

(M

ln didm nam gifra tu vd diOn tro). HQ thric dring ld :

A.ZL-Z|

B.2Zr=7"

c.zr=/1"

D.3ZL-

22.

q;fuit21zEatdi€niipxoaychidu

u

=UJ-zcosatl(V)vdohaiddudoanmachABg6mthudncAmL,diQntrdRvd

tir Aien C mac nOi tiSp theo thir

tu

trCn.

Gqi

Ur-, Un vd Uc tan

tuqt

li

c6c cliQn 6p hiQu dpng

gita

hai ctiu

m6i

pnan

tt.

Bi6t diQn rip gifra hai dAu do4n m4ch

AB

vudng pha so

vdi

diQn 6p gifl'a hai ddu do?n m?ch NB (<to4n m4ch

NB

g6m R. vd C _).HQ thric ndo du6i ddy ld dirng ?

A.U2=U2n+Ui+Ui.

B.U3=Ui+Ul+U'?.

C.Ui,=Ui+Ul+U'?

D.U'?R=Ul+Ul+U'z

CAu

23:

M4ch

RLC

nOi tiiSp

giim

cuQn ddy

(L, r)

vd tp dipn C.

D{t

vdo hai cl6u do4n mqch mQt hiQu diQn th6

u:

60J7 sin l11zrt(V).

DiCu chinh C de Uc

:

Uc,o:

100V. Flieu dign th6

gita

hai

diu

cuQn ddy

khi

ct6 ld:

A.40

V

B.

60

V

c,

30v

D.

160

v

Ciu24:

Mach dao d6ng LC gdm tu C = 200 nF vh cuQn thudn cAm

L=2mH.

Bidt cudng d0 ddng diQn cuc dai tren

L

ld Io = 0,5

A. Khi

cudng dQ ddng diQn tr0n

L

h

i

= 0,4A thi hiQu diQn thd gifra hai bAn tu ld

A.

IOV

B.2OV

C'3OV

D.4OV

Cflu 25:

Khung dao tlQng

LC

c6

C:2A

pF,

L

:

200 mH.

Chqftt

:

0

li

lfc

tU c6 hiQu di€n thi5 cyc tl4i Uo

:

4 V.

Ning

lugng ili€n truong tai

thdi

tti6m

t:0,125T

ld

A.40

pJ

8.60

_PJ

C.80

_FJ

D'

100 _PJ

C1uiSz Khi mic

tu Cr

vio

m4ch dao d6ng

thi

m4ch thu dugc s6ng c6 budc s6ng 1.1

:

100 m,

khi

thay tu Cr

bing

tU Cz

thi

m4ch thu cluqc s6ng

Xr:

lS

m. V4y

khi mic

hai tU n5i ti6p

voi

nhau

rdi

mic

vdo m4ch

thi

mach

bit

tlugc
s6ng c6 budc s6ng ld:

A.25

m

8.30m

C.50m

D.60

m

D.

r2lt3

Cdu 27 z Mactr

LC

l!

tuong gdm cuQn dAy

L

vi

tu di0n C

=

2O nF.

Khi

dao dQng trong m4ch dn

_di._nh,

9!l

t4

9V"
dai cfra hi€u di€n rhd giffa

trii

Uan tu diQn l]r Us

=

I

V

vh cuong dQ ddng diQn

trolg

mech ld

vi

Io ₌0,2

A.

Hi€u di€n
th€

gita

trai Uan tu dicn tai thdi didm

tudng

d0 dbng diOn trong mach c6 gi6

tri

bang 100

mA

ld

</div>
<span class='text_page_counter'>(3)</span><div class='page_container' data-page=3>

Trtrdng TIIPT chuy2n KHTN, Dgi hpc KHTN, DIIQG Hd

N|i

Trang314
CAu

28:

M4ch dao ddng

LC c6

C

₌

0,2pF,L=

2 mH. Do

m4ch c6 di0n tr&

R = 0,01C),

ndn dao dOng trong
m4ch

tit

ddn. Dd duy

tri

dao dong v6i hiOu di€n th€ cu.c dai

gita

hai bAn tu di€n

li

Uo

₌

12V thi

phAi cung cdp cho
rnach mQt cOng suAt ld

A.P=24.10rW

B,

P=42.10rW

C.P=64.10'6W

D.'

P= 72]0-6W

A.800 ps.

B" 1200 ps C, <i00

ps.

D.400

ps

L.2,5V.

8.5

V.

c.7,5

V.

D.8

V.

Cf,u

31:

Trong mpng tliQn

34ha

tei d6i ximg,

khi culng

dQ ddng <tiQn qua mQt pha ld cqc <I4i Is

thi

ddng tliQn qua
CAu 292 Trong mQt m4ch dao <tQng

LC

li

tirong dang c6 dao dQng di6n

tir tg

do. Khoang

thdi

gian ngan nndt ae
cucyng dQ ddng ttiQn qua cuQn cdm

giim

tir

d0

lon

cqc cl4i xuOng cdn mQt nfta dQ

l6n

cgc

tlai ld

800 ps .

Khoing

thdi gian

ngin

nh6t dO

ning

lugng tir trudng trong m4ctr,g{4m ttr d9

lon

cqc dai xulSng cdn mQt nria giri

tri

tt6 ld

Cf,u 30:

Trong mQt mpch dao C6ng

LC

li

tucrng, hic cuong dQ d.ong iliQn trong m4ch

bing

0

thi

hieu tti6n thii tr0n
tU

tliQn.bing

f O

V.

ffti

nAng

luqnf$r

tru]ng

trong cuQn day giip

3

ldn nAng

luqng

diQn tru&ng trong tq

thi

hiQu
di€n thO tr€n tq

blng

hai pha kia sE c6 cuong tlQ

A. bdng Iel3 , ngugc chi6u

v6i

ddng trdn.
C.

bing

Isl3 _,

cing

chi6u

vdi

dopg tr6n.

B.

bing

lsl2

_{, cingchiAu vdi}

d6ng tr€n.
D.

bing

Is/2 _,ngugc chiAu

vdi

ddng tr6n.

Cffu 32:

Trong

thf

nghi€m Ydng vd giao thoa cria 6nh sr{ng don s6c.

Khi

dit

vdo

mqt

trong hai khe m6t

bin

mdt
song song c6 chidt sudt

_{n, =}

1,5

thi

ven ffung mm dich chuydn mQt doan xo, ndu thay

bin

mAt song song b6ng mdt
bAn

m[r

song song c6

cing

kich thudc nhtmg chidt sudt

nz=

1,25

thi

vin

trung tam dich chuydn m6t doan Ih:

A:

0,5x,

8.2x,

C.0,25x,

D.

0,75xo

C0u

33:

_Quangph6

cia m{t trtri

quan siit dugc tr6n mat d6t ld:

A.

Quang pnO vactr phSt

xa

B. Quang ph6 lien tr.rc

C. _Quan[phO vach fi6p

thU

D. Quang ptrO tien tltc xen k€

vdi

quang ph6 v4ch

Cffu 34:

Trong'mQt

thi

nghiQm ldng v€ giao thoa 6nh s6ng, cho

khoing

c6ch

gita

hai khe

a:2mm;

tir

hai khe d6n

min D

:

lm;

ngudi

ta

tto tlugc knoang v6n giao thoa trdn mdn

ld

i

:

0,2mm. Ten s6 cria bric xa

ding

trong

thi

.r.rghiQm _ln

A.7,5.1014112

CAu

35:

Lu6.ng lSng

kinh

e6

A

:

0,01 racl, ehi6t su6t n

:

1,5; khe s6ng S

nim

trong

m{t phing

chung c[ra hai d6y,
c6ch lSng kinh 20 cm.

Cho

),:0"6

pm.

S0 v6n sang quan srit dugc tr6n

min

c6ch ldng

kinh

180 cm ld

Cffu 36:

Trong

thi

nghiQm giao thoa l6ng,

khoing

crich

tu

v6n s6ng bQc

2

d6n vAn s6ng

b{c 7

ld 4,5mm. Khoang
cdch gifta hai khe

a:

lmm;

tir hai khe d€n mdn D

:

1,5m.

Budcs6ng

rinh sring ld

4.27

8.29

c.31

D.33

A.4,4

pm

B.0,5pm

C. ),6

pm

D.0,7

pm

C6ar

37:

Trong sr; giao thoa efra ludng guong phang ta

c6

a:5.10r

(rad), khoang c6ch

tir

nguiin s6ng d6n giao
tuytin

haiguong

ld

d:

50 cm. Mirn

d{t

song song

vdi

tlo4n n6i 2 6nh crla S.

Khi )"

-- 0,5

pm

tr}n

man c6

5l

vdn
s6ng, trong d6 hai m6p cria hQ v6n ld vdn s6ng. Khodng cilch tri rrtdn dtin giao tuy6n cria hai gucrng ld

A.l:lm

ts"1=2.m

c.

1:0,5

m

D.

1,5 ln

8.85.10t4H2

c.6,5.lar4rtrz

D. g,5.l0t4Hz

Cf,u 38;

Chgn phuong 6n sai"

&

Bdn ctr6t

crtaiia

hdng ngoai ld s6ng ttiQn

tir.

B. Tinh ctr6t nOi b4t nh6t cria tia hdng ngo4i ld tdc dgng nhiQt.
C. Tia hdng ngo4i c6 kh? nang Aarn xuy€n

ttit

D. Tia h6ng ngo4i tluqc dirng dC s6y kh6, suoi 5m, chgp furh.

Ciu

39:

Trong nguyOn

tu Hitlrd

khi Olectron nh6y tu

qu!

if4o

N

vA

qu!

tl4o

K thi

nguydn trt phdt ra bric x4 co budc
s6ng 1., _,khi Olectron nhdy trl quy

M

v€

qu!

d?o L

thi

nguy6n tu ph6t ra brlc x4 c6 budc s6ng

ld

)"

. Chgn phuong 6n
dring:

A.3\=44

8.27\=+4

c.254=284

D.2564=67s4

Cdu 40:

Trong

thi

nghiQm Y-dng v6 giao thoa 6nh siing, khoang c6ch

gita

hai khe ld 0,5 mm, ttr hai khe dtin man

lit2

m. Ngudn srlng dirng trong

thi

nghiQm gdm hai

bfc

x4 c6 budc s6ng 1,1

:450

nm

vi

l.z

:

600 nm. Tr€n mdur

quan s6t, gSi N4,

}{ln

hai cliOrnd cirng mQt phfa so

v6i

vdn trung tdm

vi

c6ch vdn trung tdm

lin

luqt

li

5,5 mm vd
22 mm. Tr€n do4n

MN,

s6 vl

tri

vdn sring trirng nhau

cia

hai brlc xa ld

4.4.

B. 5.

d.3.

D.2.

CSu

41:

Mach dao ciOng

ly

tudng gdm cudn

cim

vh tu di6n c6 di€n dung C, mach hoat dOng binh thuong

thi

bit

duocs6ng

2o.NdumicsongsongtsCv6ituC'=4Cthimachbitduo.cbudcs6ng

_4.Gi|tri

z!

tfnhtheo

_d

theo bidu thrlc:

</div>
<span class='text_page_counter'>(4)</span><div class='page_container' data-page=4>

Trudng THPT chuy€n KIITN, Dgi hpc KHTN, DHOG Hd

N|i

Cfru

42zTinh chu

k!'

b6n rd cira mQt ch6t ph6ng x4, cho bidt

tai

thdi

didm

t',

t1i sd gifra
Tai thdi didm

t,

sau

t,

414 nghy,

tli

sd d6

lh

l:63

r€'

-4,.69

nghy

B.

138

ngdY

C'207

ngdY

Ciu

43:

Tia R<rnghen c6

;.il;;;;ffi;ilGv6tuy6n.B.ctngbanc!Atvdi.s6ngdm-,.r;

C.

die;tich

am.

D. budc s6ng ldn hon budc s6ng-tia hdng ngo4i'

CAu 44:

Trong

thi

nghiQm l6ng vA giao thoa anh sang khodng c6ch

tir hai

khe di5n man

D

:2m,

khoing

c5ch

gita

hai khe a

:

0,5mm.

Trong khodng 2,8cm

nguii

ir

,tt5v

c6

I

ivdn

sang liOn

titip,

hai dAu

ld

vdn s6ng.

Anh

s6ng sir

ilt:.TJ"'c

s6ng

ld:

B.0,5pm

c.0,6pm

D.0,7pm

Ciu

45: Khi

chidu vlio catdr

cia

m6t td bdo quang di0n brlc xa c6 budc s6ng

)'

thi

hi€u dien thd hdm ld 4,8

v'

ndu
chidu brlc xa c6

budc

s6ng

2)"

lhr niQu

{iqq

thd ham

le

1,6

V' Gi6i

han quang dien cira catdt l}r

A.3)"

8.4,1

c'sL

D'64

cau

46: Tim

kdt luan dring

khi

rr6i vd cdc day quang phd trong

qlang

phd ph6t x4 cfra nguyon tir

Hydr6

A.

;ay

pu,"|"n na*oong ving

tu

ngoai

B

Ddy Baimer n6m trong virng 6nh s6ng nhin thdy

C.;;i;;i;;"il

o*g"*rlgidng"ngo4i

f'.'uay

Lyman nam trong vung

trlngo4i

Cfru

4i;

M6t

ngudn phZng x-e

"o

.n"-ti

b6n 16

T

vh

tai thdi

did.m'oan ddu c6 48No hat nhan.

H6i

sau

khoing

thdi

thhnh

hat

nh6n con

3Trhi

ti

sdtrcn

lh

c.6

Trang4l4
hat me vd h4t con

lh

1:7.

D. 552 nghy

D. 5,80

MeV

WrOi ctrft A

vi

B co sti nat nnan
D.514.

Mg24. T?i

thdi

didm b6t ddu

D.9

gian 3T, sd h4t nhdn cbn lai lh bao nhiOu?

D.

16No

A.4llo

B.

6No

c.8No

cdu

4g: cho

n6ng luqng li€n

kiit

rieng cna _]

D

ld 1 _,12Mev vd cria _]He

ld

2,57

Mev. N[ng

lugng t6a ra trong phan

rmgnhi€thach

_]D

+]n

-+

lHe-+

jn

ld

A.

1,45

MeV

8.3,23

MeV

C'

3'55

MeV

C6u 49:

Chu kl ban rd cua hai chdf ph6ng x4 A

vi

B tan tuqt ld Tn vir Te

:

2T

_n

Ban dAu hai
nhu nhau. Sau thoi gtdn t

:

4TA thi ti sO gir.xa s6 hAt nhen A

vi

B diph6ng x4

li:

Az

Il4

8.4

C'415

CSar

50:

Ddng

vi

Na24 ph6ng

xq

P

vdi

chu

k!'

bdn rd

T,

tao
khAo s5t thi

tf

sd khdi luong Mg24 vb Na24 ld 0,25' Sau thdi gian

A.3

ts.5

---'--HCt---[.d;,*^-",.",;;iFL
-srlitini.,i; _->1"i!litl' r;orc iiiitna;.;el irz

rRl tor:o$2.?!!..sd .

</div>
<span class='text_page_counter'>(5)</span><div class='page_container' data-page=5>

TRUONG THPT CHUYEN

KHTN

DAp

,N

rHI'THO

DAr

Hoc

LAN

v

NAM

Hoc

20tt -

2012
nnON

vAr

lf

-n\

s\Tr$

iLZ.9-]ir\l"'-el

ffi\?'A

'W'r'+$

</div>

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