﻿Electron Theory of Metallic Conduction. 431 



or again using 



f /2 = |r' 2 and dgdrfd? = 4nrr'*dri 



so that the integral reduces to a single integral in r\ from 

 to co , we get 



47rNe 2 L ff „ Cvi^e"** I PL • \ 7 , 



^ ' Hf" 



On using v=qr' 2 we find 



4N^ A/ f ^ / t , K,Vg • A, 



J = i^rV ^ E o ;^CW° ; + ^ ^ T' ; 



or 



>7T WW 



wherein 



J=2a /^_ . Ng2 ^ . EoCAcospf + Bsinp*), 



Joo ve~ v dv /■»» \/ve~ v dv 



If we use 



4. 1 B 



we find that, again, 



J = 2 A / E cos (pt — e) sec e. 



V Sir mu m KL ' 



The conductivity in such cases is defined usually by the 

 average rate of dissipation of heat, which in the present case 

 is the average value of 



E J = 2 \ / r> - - E 2 cos pt cos ( pt — e) sec e, 



V 37r mu m T 



which is simply 



V o7r mu , 



