.


:




:

































 

 

 

 


8.




 

- . . - , .. .

- , , m 0 , = const, υc= .

, , , , , . . .

 

, N , . , .

f (υ), . , dv, (v), , . f (v) , v υ+dυ, ..

=f (υ) ,

f (υ)= .

, f (υ) :

f (υ) =4π υ2 . (8.1)

(8.1) , ( m 0 ) ( T). (8.1) .8.1.

 

.8.1

v , υ 2, , υ . υ.

(υ) , υ υ+dυ, . , , 1. , f (υ) .

, , υ. , (8.1) ( ) υ, f (υ):

.

υ =0 υ = ∞ (8.1), υ, , υ:

υ = = . (8.2)

(8.2) ,

( ). , , , .

> ( )

υ c = .

f (υ) , :

υ= = . (8.3)

, :

υ = ,

υ= ,

υc= .

dN(υ)= N f(υ) = N 4π υ 2 (8.4)

w. υ wk = . (8.4) v = =(2 m 0 wk)-1/2 dwk, :

dN (w)= = Nf (wk) dwk,

dN (wk) - , , wk wk+dwk.

,

f(wk)= .

:

w = = = kT,

. . , (7.18).

 





:


: 2016-11-18; !; : 560 |


:

:

, .
==> ...

825 - | 748 -


© 2015-2024 lektsii.org - -

: 0.008 .