V1 V2
5
: 9
âu :
u = 120 2cos100πt(V) 1 1 AB
A 2 /2 B 3/2 C.1 D.1/2 âu :
A 3/4 B.1/2 C.4/3 D.1/4 âu 3:
u =150cos100πt(V)
A C = 1, 06μF B C = 0,16μF C C = 10, 6μF D C = 106μF âu 4:
2
A Fkvmax = 0,4 N; F = 0,5N B Fkvmax = 2 N; F = 5N C Fkvmax = 2 N; F = 3 N D Fkvmax = 1 N; F = 3N âu 5:
0
Q0 3Q /2 1 0 0 2Q /2 2 2-t1=100 -6
2 10
A 0,676H B 0,756H C.0,576H D.0,567H âu 6:
g = 10m/s2
A 2,0N B 4,8 N C 3,2 N D 2,8 N âu 7:
2
A 1cm/s B 0,9 cm/s C 1,2 cm/s D 0,8cm/s âu 8:
âu 9:
âu :
âu : x = A cos ωt -1 1 π (cm) 6 x = A cos ωt -2 2 (cm) x = 3 3cos ωt + (cm) 2 1
A 9 3 cm B.15 3 cm C.18 3 cm D.9cm âu :
2
Trang 2
A x = 10cos 10t +2 (cm)
3
B x = 10sin 10t + 3 (cm)
2
x = 10cos 10t - (cm)
3
D x = 10cos 10t + 3 (cm)
âu 3: 0
0
A 1 400 2
400s B 1 300 2
300s C 1 600 5
600s D 1 500 3
500s âu 4:
1
L=L2=L1 1
A -4 1 1 3.10 L = H; C = F 4π 2π B -4 1 4 3.10 L = H; C = F π 2π C -4 1 4 10 L = H; C = F π 3π D -4 1 2 10 L = H; C = F π 3π âu 5: -
1, S2
A 0,2mm B 0,6mm C 0,8mm D 0,4mm âu 6: - λ
1S2 1 2
1S2 Δ
S1S2 2Δ
âu 7: x = 5cost + /3 (cm)
A.605s 3 B 304 s 3 C 604 s 3 D 708 s 3 âu 8: 210
84Po α
3
âu 9:
3
’ ’ ’ ’
âu : N u n n m ch g m cu n c m thu n L m c n i ti p v n tr thu n R = 1 c c a ngu n m t chi n tr n n n n cho m t t n dung C = 2.10-6 c i, ng t t n kh i ngu n r i n i t n v i cu n c m thu t m ch d n t t do v ng .10-6 s n c i b c a r b ng A 2 B 1 C 0,5 D 2,5 âu :
âu :
âu 3: λ
-34
J.s, e=1,6.10-19C, c=3.108
A 0,258 A B 0,416 A C 0,125A D.0,179A âu 4: β+ :
Trang 3
âu 5:
λ
A.29 B.27 C.25 D.26 âu 6: 1O2
1O2
1O2
A 40 cm/s B 53,4cm/s C.26,7cm/s D.20cm/s âu 7:
A 83 B 85 C.77 D.81 âu 8:
A f=170Hz B.f=200Hz C.f=85Hz D.f=255Hz âu 9:
âu 3 :
AB AM
UMB
A R B L,C C.R,L D.C,R âu 3 :
Δφ +
A 12 Hz B 12,5 Hz C.8,5Hz D 10Hz âu 3 :
âu 33:
-
A 60 cm/s B 240cm/s C 40cm/s D 120cm/s âu 34:
0
âu 35:
C
âu 36:
1 2
A 2 1 2 2U R + R B 2 1 2 U 2 R R C 2 1 2 1 2 U (R + R ) 4R R D 2 1 2 U R + R âu 37: A
0=0,1nW/m2
A 0,1nW/m2 B 0,1GW/m2 C 0,1W/m2 D 0,1mW/m2 âu 38:
MB
L
A UAM B UAM C UAM D UAM
X
Trang 46
8
1,5 2,0
x2
x1
-6
0
x(cm)
t(10-1s)
âu 39:
A 2π 7cm/s 3 B 2π 3 cm/s 3 C 2π 5 cm/s 3 D 2π cm/s âu 4 :
α α 0 1 α 0 1
1 α
A 350 B 300 C.450 D.250 âu 4 :
B
âu 4 : 15
y ra 5mm3
âu 43:
âu 44: 1
, Re1, Mi1 , Fa1 , Sol1, La1, Si1
2
-
2
n 1 2 n f 1 log f 12
1
A Fa1# B Fa1 C Sol1# D.Sol1 âu 45:
2
2
âu 46:
A 5 Hz B 12,5Hz C 50Hz D.75Hz âu 47:
α0
A 2mg (1 - cosα ) 0 B mg (1 - cosα ) /2 0 C mg (1 - cosα ) 0 D mg(1 - cosα ) 0 âu 48:
λ<λ0 λ
A 0
âu 49: 1 2
âu 5 : 7
W,
NA=6,022.1023mol-1
D
B
E