2ο θέμα γενικών εξετάσεων
Transcript of 2ο θέμα γενικών εξετάσεων
1. 91,6 MHz 105,8 z. LC :
.
.
. .
.
2. LC, Q (q= Q/2), UB :
. 25%
. 50%
. 75%
.
.
3. m k 1 f1. , f2, 1. 1, f :
. f > f2.
. f < f1.
. f1 < f < f2.
.
4. m . x x = t, . , , F= - m2x.
.
5. (L1C1) (L2C2) . (1) (2) C1 C2 , . 1/2 :
. 2.
. 1/4
. 1/2
.
6. , , :
x1 = 510t x2 = 8(10t + )
. y = 3(10t + ). y = 310t . y = 11(10t + )
.
7. t = 0 o o. t, 1/4 ,
. Eo/16
. Eo/4
. 15Eo/16
.
8. 1 . 1 .
1 1max.
1 2 , .
2max 2, :
.
. .
.
9. , , m d/2, 2 .
( )
( )
( ) m
, d. , :
.
.
.
.
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10. L, C C1 = C2. .
L1 L2 :
. L1 = L2/2
. L1 = 4 L2. L1 = 2L2
. L1 = L2/4
.
11. m . f = f, f . m , , :
.
. fo/2
. 2 fo
. .
.
.
. .
. .
. .
.
12. LC R f1. 1. f1, . f1 .
, ;
. .
. .
. 1.
.
13. L1C1 L2C2 L1 L2 = 4L1 .
. 1 = 22 . 1 = 42 . 1 = 2/2
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14. .
. . . .
. .
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15. (LA, C) (LB, C) . C.
. LA, LB
. LA =4 LB.
. LB =4 LA.
. LA =2 LB.
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16. t.
. ; . ;
. ; 17. , D D , D > D. ;
. . .
.
18. , x1 = t x2 = 2At.
, :
.
. 3
. 2
.
19. Io k m, .
. ;
.
. , .
20. LC , . , ;
.
.
.
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21. , . d , . , ,max/,max ;
. 1/2
. 1. 2
.
22. 1 2 k1 k2 , k1 = k2/2. 1 2 x 2x , . :.
. 1 . 2 .
23. . . = 4.
.
24. LC 1 2 .
C1 Q1. T to = 0 1 , LC1 . t1 = 5T/4 , LC1, o 1 2. Q2 C2, C2 = 4C1, LC2
) Q1
) Q1/2 ) 2Q1
.
25. q = Q/3, q Q , UE/UB :
. 1/8
. 1/3
. 3 .
26. , . : x1 = 0,2(998t), x2 = 0,2(1002t) ( S.I.). () :
. 2 s
. 1s
. 0,5 s
.
27. . max max. x, , , , :.
.
.
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28. m. . ,
.
.
. .
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29. 10Hz. 10Hz 20Hz,
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30. LC. , . /4. .
.
.
. 0
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31. , . .
. .
. .
. .
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32. LC .
. .
. .
. .
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33. f . 2. 2f , . 2
. 4
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34. k, ( ). . m. . :
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35. . 1 m1 2 m2. 1 m2, 2 m1 (m1 m2), .
. 1 2 . 1 1 2 2, :
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36. 1 2 m 2m k k/2, , .
.
A1 1
. o
. o
. o
2 2 .
37. .
to = 0 . t1 = 5T/8 . Imax,1 L1C Imax,2 L2C, :
. ,
. ,
. .
L1 = L2
.
1. :
= 752( 12.1010t 4.104x )
. S.I. ( c = 3.108 m/s) .
2. nA nB, nB < nA.
A. N .
. ;
. ,
. .
.
3. xx K 1 2 . y = At. () 6cm. 4cm. xx, ,
. A = 2
. = 0
. 0 < < 2
.
4. :
. = 75 2 (12.1010 t 4.104 x)
= 25.10-8 2 (12.1010 t 4.104 x) (S.I.)
. = 300 2 (6.1010 t 2.102 x)
= 100.10-8 2 (6.1010 t 2.102 x) (S.I.)
. = 150 2 (9.1010 t 3.102 x)
= 50.10-8 2 (9.1010 t + 3.102 x) (S.I.)
; c = 3.108 m/s .
.
1. 1 2, , f . 2. .
. 2 . . 0
.
5. .
. .
. .
. .
.
6. n : = 100 2(121012 t 6104 x) ( S.I.).
c = 3.108 m/s m/s, o :
. 1,2
. 1,5
. 2
.
7. :, x, y cm t s. :
. 2 cm
. 4 cm
. 8 cm
.
8. y = A t . x. , xA, xB A, B. ;
. A < B
. A > B .
9. f1. , . , , f2, , 7 . f2 :
.
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.
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10. , . , . :
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11. . r1 r2 :
.
.
.
= 0, 1, 2, , .
.
12. (1), (2) (3), n1, n2 n3 . ;
. n3 > n2 > n1
. n3 = n2 > n1
. n1 > n2 > n3
.
13. (1) (2) = 4 cm. r1 = 17 cm (1) r2 = 9 cm (2).
. 0
.
. 2
.
14. 1 1. 2 (2 1).
. 2 = 1 (2/ 1). 2 = 1 (1/ 2)
. 2 = 1 .
15. 1 2 4 Hz, 20 cm/s. r1 = 17cm r2 = 12 cm . .
. 2.
. .
.
16. n n . n = 2n,
. = /2. = 2. = 4 .
17. . c ( c), crit .
. .
.
18. , = . n = :
. .
. .
. .
.
19. , , . .
. ,
.
. .
.
20. S.I. = 30 2(6.1010 t 2.102 x). S.I. =10-7 2(6.1010 t 2.102 x).
: c = 3.108 m/s.
.
21. 45. :
. 45. 45. 45
22. (1), (2), (3), n1, n2, n3 , .
2 > 1, :
. n1 = n3
. n1 < n3 . n1 > n3
23. , n, n , n > n. . . .
. .
. .
.
24.
= 3102 2(81011t 4103x) (S.I.)
B = 10-6 2(81011t 4103x) (S.I.)
. (/) .
. / .
. / .
c = 3108 m/s.
25. 30. , .. < c/2
. = c /2
. > c/2
26. M 60o , .
. .
. .
. .
: n = 4/3 , n =1, 50 = 0,75 60 = 0,87
27. , .
, , . , OB/OA:
. ,
. ,
. .
1. , 24 .
2. . , .
3. () () , . . F . () . () .
() t , () t, :
. t > t . t = t . t < t
.
4. , . . , :
.
. .
.
5. , . . :
. .
. .
. .
.
6. . :
. .
. .
. .
.
7. R cm.
H R/2
. 3cm /2
. 2cm /3
. 5cm /2
.
8. . . . :
. . . .
9. x y. .
, , , > , y x,y
. . .
.
10. () (), .
, .
. I = II. I < II. I > II
.
11. , (L1) (L2), , L1/L2 = , . 1/2 :
. 6
. 12
. 24
.
12. , , , .
, ;
. > . <
. =
.
13. m R . cm. Icm = (2/5) mR2.
.
.
.
.
14. .
. .
. .
. .
.
15. R1, R2 R1 > R2 , . w , ;
.
. .
.
16. 1 2 R 2R, 3 , .
1 2,
. 3/2
. 1/2
. 1
.
17. F1 F2 , ,
. .. .. . .
18. . .
. .
. .
. .
.
19. , , R, R R > R.
.
;
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20. AB () . 1, 2 m .
. 1.
. 2.
. .
.
21. R () f . O .
. f.
. f.
. f.
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.
22. . . . :
.
.
.
23. , , . (), :
.
.
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24. , , . , 5/2 . , , :
. 1
. 5/2 . 2/5
25. , m1 m2, d2 d1. zz.
m1 zz
.
.
.
m2 .
26. , (t=0) , , .
K ;
27. . .
F, ,1 , w = F ,2. :
. ,1 = ,2
. ,1 > ,2 . ,1 < ,2
Doppler
1. mA mB. :
. mA = mB
. mA < mB
. mA < mB .
2. m, , 4m. , . , :
.
.
.
.
3. 1 2, 1, . 1 2
. 50%
. 100%
. 75%.
.
4. m m, , . , .
m mB :
. mA/mB = 3/5
. mA/mB = 1/2. mA/mB = 2/3. mA/mB = 3/2 .
5. S = /10, . . , f1, , f2. f1/f2 :
. 9/11. 11/10
. 11/9 .
6. m .
. 2.
. /2.
. /3.
.
7. m1 1 m2, . m1 1/5 . . m2/m1 = 3/2. m2/m1 = 2/3
. m2/m1 = 1/3 .
8. m 1. 2 2 < 1.
:
.
. .
;
.
9. m 2m, , . ,
. 1/2
. 2
. 1
.
10. US , 1 2 . . 1 2
. 2. 1. 3 .
.
11. m1 m2 . 1 m1 2 m2 ,
. . .
.
.
12. , 3m m , . . ;
. /2
. /2
. /4 .
.
13. . m = 100 m/s . V = 2 m/s, /m :
. 50. 1/25 . 49
.
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14. m 1 . , , .
.
15. A . , .
16. m1 m2. . m1/m2 :
. 1
. 1/3
. 1/2
.
17. . , , fs /10, fs . , / :
. 10
. 1/10. 1/20
.
18. S . , .
,
. .
. .
. .
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19. S S . . , 1 2 . :
.
.
.
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20. . m, , . . 1/3 , :
.
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.
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21. mA mB = 2mA. , :.
.
.
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22. 1 m 2 2m.
1 . .
.
.
.
23. S fs. u , - , f1. , u, S, - , f2. :
. f1 > f2 . f1 = f2 . f1 < f2
24. . .
f1 f2. :
. f1 < f2. f1 = f2. f1 > f2
25. m1 = 2 kg m2 = 3 kg 1 = 4 m/s 2 = 2 m/s ( )) . :. 5 J. 10 J. 20 J
26. . . 30% , . ,
. 2/17
. 3/17
. 4/17
27. f. , . f1, f2 . f :
.
.
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28. , m1 m2, . 4 m1, .
, /3. :
.
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29. S , .
S S=2 fS
. fS
. fS. fS
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