Câu Lạc Bộ Yêu Vật Lý
_____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
_____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

https://www.facebook.com/club.yeu.vl
Câu 1: B
Câu 2: C
Câu 3: D
Câu 4: D
Câu 5: B
Câu 6: B
Câu 7: B
Câu 8: B
Câu 9: A
Câu 10: A
Câu 11: A
Câu 12: A
Câu 13: D
Câu 14: D
Câu 15: C
Câu 16: B
Câu 17: C
Câu 18: C

Câu 49: B
Câu 50: B
Câu 1: D i 
Câu 2: L bii gian, li suy ra chn C
Câu 3: Mt vu, t s gi  (  thu h
0). Khi t ng gim mt na so v s  
A.
δ
4
B.
δ
16
C.
δ
4δ+1
D.
δ
3δ+4

Lời giải: [Hinta]
1
1
1
44
4
1
4 4 4 4 4
1
44
34




V
Câu 5:  bii ta th  vi khoa hai
ngn s va chm gia thuyu cp bn s 
t t ca thuy truyT truyng
A. 7,5m/s.
B. 2,5m/s.
C. 2,0m/s.
D. 4,0m/s.
Lời giải : [Hà Dũng]
ng kiu 2 vc chiu gc 

 








 







4
0 06
0 15 10
, ( )
,
x
xT  
. V
Câu 11: Cho mn t u, hin th cu bn t 
0
. Ti thm
hiu n th u bn t gin so vi hin th  ch bng kI
0
, vi
I
0
 i trong m c
B. 99,4%
A. 99,7%
C. 92,3%
D. 96,1%
Lời giải: [Hà Dũng]





 



n tr  u cun cm thun L  t thm. H th
A.
2 2 2
RL
90u +10u = 9U
. B.
2 2 2
RL
45u +5u = 9U
. C.
2 2 2
RL
5u +45u = 9U
. D.
2 2 2
RL
10u +90u = 9U
.
Lời giải: [Hinta]
 
22
0 0 0 0
2 2 2 2
2 2 2 2 2 2 2 2 2
0 0 0
2 2 2 2
0 0 0 0
2 2 2
3 3 10
99

2
He
3
. Bi ht khi
cng ngh ct c phn ng nhing ngh ct
sau phn 
2
= 931 (MeV).
A. 7,7187 (MeV).
B. 7,7188 (MeV).
C. 7,7189 (MeV).
D. 7,7186 (MeV).
Lời giải : [Hà Dũng]
E=3,25=



 






 => 


V
Câu 17: Chic x n s f
1

.
C.
1
2
f
25
f 27

.
D.
1
2
f
128
f 135

.
Lời giải: [Hinta]
 3 bc x  c x  n=5
 T s tn s hai bc x 
2
2
1
1
25
3
1
27
1
5


A.
12
3
B.
2
1

C.
1
2
D.
3
2

Lời giải: [Hinta]


 
 
2
2 2 2 2 2
2
2 2 2 2 2 2
100 3 100 200
2 100
AB Y
NhËn xÐt ta thÊy:
VËy chøng tá u vu«ng pha víi u . Sau khi t¨ng f th× tÇn sè m¹ch t¨ng,
vËy hép Y chÝnh l¯ cuén d©y v¯ hép X l¯ tô ®iÖn


m

48,0
2

n gi
  
A. 
B. 
C. 
D. 
Lời giải: [Hinta]

1
2
0 64 4
0 48 3
,
,



.
Suy ra trong khop gi 
Vn gi 
Câu 22: H
1
1
A


2
2
A
Z
Y

1
2
A
7A
n thm t
2
 s kh
A.
1
2
7A
8A
.
B.
1
2
A
31A
.
C.
1
2
A















 



 
 

  

.
i 

:




Câu 24: Chiu bc x n s t kim lo n. Gi s mt
p th  dng mt phi bi
Nu tn s ca bc x chiu t
A. 4K + A
B. 2K
C. 4K
D. 4K + 3A.
Lời giải: [Hinta]
43
4
W
W
W
d
dsau
dsau
hf A
KA
hf A


  



. V Cõu Lc B Yờu Vt Lý
_____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________



. V
Cõu 27: t n u n mch AB ni tip gn tr thun R, t n
cm thu t cc. Khi ch L = L
0
u du cun cm
U
L
t c
Lmax
U
. Khi L = L
1
hoc L = L
2

L1
= U
L2
= 0,9
Lmax
U
. H s t ca mch AB khi
L = L
1

2
bng 1,44. H s t cn mch AB khi L = L
0

2 0 1
10
1 0 0
0 1 0
1 0 1
2
09
0 9 0 8
2 1 44
2 1 44
cos ,
1),(2) v (3) ta có: cos , cos ,
cos .cos ,
cos cos ,




















=.>
R
UCos
Z
U
L
L



=.
max2121
2.
)
11
(
L
L
LL
L
L
L
L
L

8.0
8.1
21
0





CosCos
Cos
=> ỏp ỏn D
Cõu 28: u s dng cho chi c 208 lm/W
i nhi nh quang tu
nh quang v s tin phi tr cho phn ching
dng b
s dng ch chii mt kic khong bao nn cho vic
chi L gn nht.
A. bng.
B. ng.
C. mt tring.
D. ng.
Li gii: [Hinta] Câu Lạc Bộ Yêu Vật Lý
_____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
_____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

https://www.facebook.com/club.yeu.vl

1min

A.
-3
10
3π

B.
-3
10
π

C.
-3
10
3π

2
V.
D.
-3
10
π

2
V.
Lời giải: [Hinta]
 
   
 

Uv
R Rr
r



  


     




V
Câu 30: Cho phn ch ca Urani:
1 235 95 139 1
0 92 42 57 0
27n U Mo La n e

    
. Bit khng h
U

= 234,99 u; m
Mo
= 94,88 u; m
La
= 138,87 u; m
n

 => 







ng c




Vy kh





. 
Câu 31: Cho mn gm ba phn t mc ni tip theo th t n c t cm
n tr thu R = 100

 n
mu tn s i ta thy khi L = L
1

2
=
1



D.
4
4 3 3.10
H; F.
23




Lời giải: [Hinta] Cách giải tổng quát cho mọi bài toán liên quan đế độ lệch pha của dòng điện, có thể hơi dài!!!
i, tng tr ng hng nhau.
t
21
2  
LL
Z x Z x

12
2 1,5      
C C C
Z Z x Z Z x Z x
.(1)
Khi L=L
1

1
2
tan

12
tan tan
tan tan(2 /3) 3
1 tan tan

  


     

Câu Lạc Bộ Yêu Vật Lý
_____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
_____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

https://www.facebook.com/club.yeu.vl x (cm)
t (10
-1
s)
x
1
x
2
22
3. 1 .







V
Câu 32: Bn ht  y ra phn ng tt ht ht proton.
Bit rng hai hn tn ng 1,21 (MeV). Cho khng c
h
O
m

= 0,21(m
O
+ m
p
)
2

p
m

= 0,012(m
O
+ m
p
)
2
. t  















 




















L : 

 

 











 




V
Câu 33:  x
1

2

.
Vy 
Câu 36: Hai v m c
v       ng ca hai v 
1
2
8 3cos( )( )
2
x t cm
T



2
2
8cos( )( )x t cm
T



. Khong thi gian ngn nht k t khi khoa hai vng
nh nhn khi khoa hai vt ln nh K t thu, th
vt ci l
A. 1,5s.
B. 1s.
C. 0,5s.
D. 0,25s.
Lời giải: [Hinta]
a hai v
12

ca con l v 
1
n v 
2
vi t bi ng ci trung
m cn x
1
x
2
  v 
1
n v 
2

A. 1 cm/s.
B. 2 cm/s.
C. 3 cm/s.
D. 4 cm/s.
Lời giải: [Hinta]
 
 
22
1 2 1 2 1 2 1 2
1 2 1 2 1 2
11
100 100 100
22
1
100 50 100 2 2
2

1
= 0 m.
B. x
1
= 2 cm 
C. x
2
= 2 cm 
D. x
2
=  4 cm.
Lời giải: [Hinta]
0  
2
 
1
  vy vt 2 s
1
=A
2
=A=4cm. V lch pha gia hai v
0
.
Khi x = -  ng tng h -120
0
suy ra v -60
0
.
Kt lun: V x
2

qE
Khi chÞu t¸c dông ®iÖn trêng: g'=g+ =2g
m
'
' ' ( )
Tõ (1) v¯ (
d
td
mgl mgl
WW
mg l mgl mgl mgl
W W W mgl

  

   

   

      
5
1 25 0 25
4
'
2) , ' ,
W
WWW
W
       



).
Bit rla
3
n s 440Hz, tn s cdo
1

A. 40 Hz.
B. 65 Hz.
C. 80 Hz.
D. 95 Hz.
do
rê
mi
fa
sol
la
si
do
1
1
1/2
1
1
1
1/2 Câu Lạc Bộ Yêu Vật Lý
_____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________










. V
Câu 41: Cho mt con lng . Li ci c
rng vt gia tc a = g/2 l
1
= 9 N 
2
= 5 N. Cho bi
 vng h ng ca con l
li ci cng
A. 10 N.
B. 14 N.
C. 7 N.
D. 4 N.
Lời giải : [Gs Xoăn]

Câu 42: Cho mt con lng. Mt hc sinh ting. Ln th nht,
i th nh i gian ngn nht vn v i trin th t v v 
n dng ri th nh i gian ngn nhc phc hi chi s
x2
y3




.
 ng   /cos/3) =



.
Gia tc ca vt khi th vt (c ca vt  v 

A)
Suy ra a = 2g.Hay a/g =.
V
Câu 43: Ti mn xoay chiu mn th hiu
dng  hai cc ci. Ni hai cc ci mt tr s 
t t i cung c
t ho s k =  n
hong ch  n th 
pha v n. Do xy ra s c  i ta ni trc tiic ca
  Câu Lạc Bộ Yêu Vật Lý
_____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
_____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

https://www.facebook.com/club.yeu.vl A. 

B qua s hp th  ngu
 ng
A
L
= 30
dB

B
L
= 60
dB.
i O hai ngun ging ngut
ng th n nht
ma x
L
c gần giá trị
nào nhất 
A. 70
dB.

B. 65
dB.

C. 77
dB.

D. 71
dB.

Lời giải : [Hà Dũng]





 







 
V
Câu 47: Cho mn AB gm mn tr thun R mc ni tip vi mt t n C vt cu
t. Gm ni gin tr thun v m ni gia t n vn
mp xoay chi hiu dng 120
3
i, tn s f = 50 Hz u dng
gi
AN
lch pha
2

so v
MB
ng thi u
AB
lch pha
3

0
26
23
u cos ,u =120 cos ,u =120 cos
AN AN MB AB
U t t t

  
   
  
   
   


6 2 169 7
3 2 6
120 120 ,
AB AM MB R MB R AB MB
u u u u u u u u
  
           
.
V n th u mch lch nhau 30
0
.
360 120 3 2
6
cos . .cos ( )
AB
P U I I I A


C
, cun cm thu
L

2

= 1.  th biu din s ph thui gian ca 
gin mn mu dng gim A

A. 50
7
V.
B. 25
14
V.
C. 25
7
V.
D. 12,5
14
V.

Lời giải: [Hinta]
Nhc c
T d ki
L
, u
C



L
 
2
200 100
7
3
50 7
2 2 9
AN C X
AN MB
X
MB L X
u u u
uu
u
u u u




    






    
