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2

1

1 :

1 2

2 1 2 1

2 1

1 1 1

0,017 17

V V V

m m

2 La3:340

0,773440

Vm

= = =

3 :

:31 3.10 Hz = d=80cm

1 3

3400,113

3.10

m = =1

d .

:1

100Hz = d=80cm

2

3403, 40

100m = =

1d .

2

1 ( (2 :

120,06 6

200

Vm cm

= = = =

3 M1M2 S:1

9SM cm=11

9 3 3

6 2 2

SMSM

= = =

. SM1

218SM cm=2

2

183 3

6

SMSM

= = =

. SM2 M2 :

M1yM1(t)=-3mm t M2 M1

MM2:yM2(t)=-yM1(t) M2 3mm 3

1 : TS

S T=TS. 1

25S

HzT

= =

2 :

. V

V

= =

:4 1 4 0,04cm cm m = = =

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:. 0,04 25 1 / V V m s = = =

3 S . t1=0,04s :

1 1 1. 0,04 4

d V t d m cm= = =

11

1d

d

= =

S S

. t2=0,06s:

2 2 2. 0,06 4d V t d m cm= = =

2

21,5 2

d

d

= = + t2:

4 :

126S SHz = >

.

224S SHz =

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1 F F .

1 2 : 40cm =

1 3 T:

t1 SF

2

3

1

90.1020 /

45.10

SFC m s

t

= = =

:

20T T msC

= =

1 4 S : . F

St=0 . 2 SP:

:3

2SP

= :

(2 1)

2

kSP

+=

. PS SQ

2SQ = SQ k= SQ .

3 t2:

t2 2

. 1,2 120

3

SF C t m cm

SF

= = =

=

SF3

4 SA :

S : : :a=2cm :T=20ms S:t=0. : S

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A S

10SA

msC

= =

SA 10ms S:

AS .7

I

)1( :20,01 4 4.10 s = =

2 :

:.C= 11,6.10 m=

3 yM :) ) ( )M S y t y t =

28.10

ds

C

= =

.

yS .

II 1N:

24 2 8.10cm m = =

C C

NN

= N=50Hz =

2 t1: )2( t1

2

1 1 1

5 55. . . 5.10

2 2 2d C t t t s

C N

= = = = =

3 PQ PQ :SQ-SP=12cm8cm =

3

2SQ SP

= (2 1)

2SQ SP k

= +k=1 P

Q .