1.
1.
. . . . . , , , .
. . . . , (). , , . : 1) , 2) . .
( ) .
- ( , , ).
, , , . , .
, . : x = x(t); y = y(t); z = z(t); r = r(t). .
.
: ,
. a, - . w: . w = onst, . n=w/2p ( ).
: . S=r´a :
S=(r)*a+(a)*r=w*r
S=(w*r)=r*w+r*w=re ( )+v*w (=v2/r ).
2.
. .
, (, ) .
s(t,x)=Acos[w (tx/c)]Acos[w (t+x/c)]=2Asin[w x/c]sinw t
w, : ()=2|sin[wx/c]|
, . . ( ) ( , ).
|
|
, . ( ) .
, , . , , , . .
:
1. , , .. ( ) , . . .
2. , . , .
L = n l/2,
l- , L, n .
2.
1.
. . .
, .
. , , , . , , .
. , , . . , V .
[x; y; z; t x; y; z; t]
1. t = t
2. DL = DL ( ).
:
x = x vt; y = y; z = z; t = t
: x = x + vt; y = y; z = z; t = t
( )
, , .
, , , . . , .
|
|
. . . .
. (Dt=t2t1=t2t1=Dt)
.
. , Dt=Dt.
2.