118.Молекулярная физика Ч 1 Колебания и волны.pdf
TRANSCRIPT
-
: 1.
: .. ,
.. , ..
-
2009
Copyright & A K-C
-
- 22 2009 ., 1 . / /, - .-. , . .. . 1 / 2 - /. : 010701 , 010803 - , 010801
Copyright & A K-C
-
3
-1/1
, -
.
, -
. . , , - , , , , - . , kx, :
xrkxxm &&& --= , (1) r .
mk
=20w , mr
2=d , (2)
(1) 02 20 =++ xxx wd &&& . (3)
(3) - ( < 0) ( )
0 cos( ),tx a e td w a-= + (4)
a0 , ,
2 20 .w w d= - (5)
, (3), - (5)
220
2dw
p
-=T , (6)
. . -
0 .ta a e d-= (7)
a0 - t = 0. - (4), , .
Copyright & A K-C
-
4
, 1, . (7) , , e 2,73 . . , :
td
1= . (8)
. , -
. , -, D :
0( )
1 0
.t
Tit T
i
a a eD ea a e
dd
d
-
- ++
= = = (9)
-, :
TD d==Q ln . (10) , (8), ,
eNT 1
==Qt , (11)
Ne , e .
Q=
pQ (12)
. , , -
, (1) - -. , (3) (4), (2) 0 .
: , ,
. (. 1) 1,
2 3, 4. - , . 5, 6, 4.
Copyright & A K-C
-
5
7. 8, - 4 .
. 1.
1. .
. 2. 3 .
, 5 1 10 , .
3. , 78 , .
4. ( (9)), D, - . , . , D ( - , ).
5. D T - . . , ET
-
6
2, 1. 7. D, , -
. , .
1 t, c , c a,
D
a,
D
, -1
1. .. / .. . ., 1989. . 2.
. 264267. 2. .. / .. . ., 1975. . 432437.
1. .
. (t) (t). 2. . 3.
, . 4. , . -
. 5. , .
D, , .
Copyright & A K-C
-
7
-1/2
, - .
-
, , , , , , , , , , . . . - , , - .
, . 10 20 000 . , , - .
, , , , , - . - , , , -. .
-
( ) cos( )t a tx w= , (t) .
(,t) , , = /, , - :
)2cos()cos()(cos)(cos),( xtakxtacxtatatx
lpwwwtwx -=-=-=-= . (1)
, k = /c = 2/ . (1) .
, - . , - . -
Copyright & A K-C
-
8
, - : , . .
, -
)2cos()2cos(),( 2211 xtaxtatx lp
wlp
wx -+-= , (2)
a1 a2 , x1 x2 .
, - a1 a2
)2cos(2 2122
21 D++= l
paaaaa . (3)
= 1 2 . (3) , -
,
22 ln=D , n = 0, 1, 2, 3... , (4)
. . . , ,
, :
2)12( l+=D n , n = 0, 1, 2, 3... . (5)
(4) (5) : , , . a1 = a2 , (3), ( ).
-, . . - , , :
0mg
RTc = . (6)
T , 0 , R
, V
P
CC
=g
.
Copyright & A K-C
-
9
- , , , . - \\
rEc =// , r
Gc =^ , (7)
, , G . G =
= 2G(1+ ), 0 < < 1/2, , > G \\ > , .
: , ,
. (. 1)
, , . () , . () . , , - . , , . . . , l .
. 1.
Copyright & A K-C
-
10
(5) (n = 0) :
2l
=D .
, , , l
l2=D . , -
, -
nl4=c . (8)
1. , - 1, ( ). - .
2. , (- ), . - l, .
3. 10 , - .
4. -. , -, E
-
11
1. , . 2. ? ? 3. . -
. 4. . .
. 5. : , , . 6. . -
, . 7. 0 ?
-1/3
-,
V
P
CC
=g -
.
- (). - S - . , c
llD
=e (. 1). - , :
Slm
=r , (1)
l .
Copyright & A K-C
-
12
. 1.
, , -
( )llSm
D-=D+ rr . (2)
, S . (2) - (l + l):
( )( )22 llS
llmD-D+
=D+ rr .
, l2
-
13
, SdtEdtSc ere =2 ,
rEc =2
rEc = . (5)
, , , , , , , , (5).
. F - - , (4)
VVEp D=D .
dp dV -,
VdV
dpE -= , (6)
, - .
, , , 16 20 000 . - , , , . - constpVg = . ,
01 =+ - dVpVdpV gg g .
pV
dVdp
g-= . (7)
(6) (7) pE g= . (8)
Copyright & A K-C
-
14
,
Vm
=r ,
mrRTp = .
(8),
mgr
RTE = . (9)
(9) (5), - :
mgRTc = , (10)
RTc
CC
V
P mg2
== . (11)
, .
- . , - . L
2lnL = (n ,
), , , , . , . , , . , /2 . ().
- = ,
ncL =02 n , (12) 0 .
(12) n . - , 0 = f(n),
LcKa 2
= .
Copyright & A K-C
-
15
1-7, . 2.
. 2. 1-7: 1 ; 2 ; 3 ; 4 -
L, . , - . , 1. . - , , - . , , - . , - . , , . L .
1. . 2. .
( ).
3. , , 1- -
Copyright & A K-C
-
16
. 1.
1 t1 = C t2 = C t3 = C -
0 , , / 0 , , / 0 , , /
4. , 2, 3, , 7 . , -. 1. , t1.
5. t2 = 4045 C. . 24.
6. , t3 = = 5560 C. . 24.
7. -, , , , .
1.
0 = f(n) - aK .
2. , aK , aLKc 2= (11), -, = 2910-3 /.
3. .
1. .. / .. . . : , 2002. . 2.
2. .. / .. . . : , 2003. . 2.
Copyright & A K-C
-
17
1. ? - .
2. . 3. . -
, , -.
4. . 5. . 6. ?
? 7. ?
. 8. -
? 9. -
? ? 10. -
?
-1/4
.
m l , , - h (. 1). - , - . - - , , 1 2 - . , .
Copyright & A K-C
-
18
. 1. (), -
. - -, .
, -. - , . 1- :
111 MJ =e , J1 = ml , 11 je &&= , M1 .
M1. , , mglsin1 mgl1. , - , . h1h2 = = h(1 2). , , -, ch(1 2), ch2(1 2). - :
)( 212
112 jjjj ---= chmglml && . (1)
, :
)( 122
222 jjjj ---= chmglml && . (2)
(1) (2) , - , . :
21 2 1 2
2 21 2 1 2 1 2
( ) ( ),
( ) ( ) 2 ( );
ml mglml mgl ch
f f f f
f f f f f f
+ = - + - = - - - -
&& &&&& &&
Copyright & A K-C
-
19
1 2 1 2
2
1 2 1 22
( ),
2( )( ).
glg chl ml
f f f f
f f f f
+ = - + - = - + -
&& &&
&& &&. (3)
: 211 jj +=Q , 212 jj -=Q , (4)
lg
=21w , 22
22
2mlch
lg
+=w . (5)
(3)
21 1 1
22 2 2
0,
0.
w
w
Q + Q =
Q + Q =
&&&& (6)
, (4) (3) - , :
1 1 1 1
2 2 2 2
cos( ),cos( ).
A tA t
w dw d
Q = +Q = +
(7)
(7) (4) 1 2
)cos(2
)cos(2 22
211
11 dwdwj +++= t
AtA ,
)cos(2
)cos(2 22
211
12 dwdwj +-+= t
AtA . (8)
A1, A2, 1, 2 , , -, . , - . t = 0 , , - , . .
aj =)0(1 , 0)0(2 =j , 0)0()0( 21 == jj && . (9) , (9) -
: A1 = A2 = , 1 = 2 = 0
( !). (8) :
)cos(cos2 211
tt wwaj += ,
)cos(cos2 212
tt wwaj -= . (10)
Copyright & A K-C
-
20
1 2, (5), - (m, l, c, h) -. - . - .
(8) , , . .
1. . , , - 1, . .
2. , - . , , -. -, 2. - .
, ( ) . . - . - . , - .
(10). , : 1 2 ( , , h/l). - (10) :
tt2
cos2
cos 12121wwww
aj+
-
= ,
tt2
sin2
sin 12122wwww
aj+
-
= .
= (1 2)/2 , (1 + 2)/2 . ,
tt weaj coscos1 = , tt weaj sinsin2 = , (11)
, cos t sin t -, cos t sin t. , 1 2
Copyright & A K-C
-
21
, - . .
(8) 1(t), 2(t), (11), , . 2. - , , - , , . . .
(. 2). -, -. , , :
= 2 = 2 1. (12)
. 2.
(5) , , . , .
, -
(. 3). , - , . - .
Copyright & A K-C
-
22
. 3.
1. 1. , -
( ). 2. -
. 3050 . 5 . .
3. 1. , , 3050 . 5 .
4. 2. - .
2.
1. , , , , . .
2. - (. 2). - 5 .
3. (12), .
3.
1. ,
(. ) , - , . 5 - .
Copyright & A K-C
-
23
2. , 2 3.
4.
1. . 2. 5 . 3. 2-, 3-, , 7- ,
. 4. -
. 5. ,
. .
1. .. / .. . ., 1975. . 459466. 2. .. / .. -
. ., 1966. . 307311.
1. . - . ?
2. , . ?
3. ? ?
4. ? 5. ,
, ( > ), - .
Copyright & A K-C
-
: 1.
: ,
,
..
. 6084/16. . . . 1,4. 150 . 396.
-
. 394000, . , . . , 10. . 208-298, 598-026 ()
http://www.ppc.vsu.ru; e-mail: [email protected]
- .
394000, . , . , 3. . 204-133
Copyright & A K-C