﻿Absorption of Homogeneous ft Rays. 731 



integrate to find the thickness of matter R in which the 

 kinetic energy is destroyed, we get 



'E 



r/.r = 1 — 



K 



r 



; 7 C P 1 



i 



^dia-nr*} 



R= cmo^ 1 _^ )h+{1 _ /32) -|_ 2 -j 



C-77l 



A, 



diere 



_ K ^, 



A=[(l~)8 2 )* + (l-/3 2 )^-2]. 



In the following table in column I. is given the value of 

 Up in gauss cm. In column II. the value of ft deduced 

 from the relativity formula 



and 



111 



H/o = — eft, {c = velocity of light) . 







:l-772xl0 7 e.m. units 







m Q 











1. 



II. 



III. 



IV. 



V. 



VI. 



Hp. 



(3. 



T/W 2 . 



A. 



E(obs.). 



R/A. 



1380 



•632 



•290 



0651 



(•018) 



(•SO) 



1930 



•752 



•516 



•176 



•064 



•309 



2535 



•831 



•799 



•355 



•124 



•349 



3170 



•882 



1121 



•584 



•189 



•325 



3790 



•9129 



1-456 



•863 



•279 



•323 



4400 



•9331 



1782 



1142 



•360 



•315 



5026 



•9476 



2-131 



1-45 



•440 



•304 



6230 



•9650 



2-810 



2-07 



•5S0 



•280 



7-190 



•9753 



3-531 



275 



•785 



•285 



8590 



•9811 



4165 



3-369 



•925 



•275 



11370 



•99 





5-30 



1-36 



•26 



The 



values of R(obs.) are expressed in gm. per sq. cm. 



In column III. the value of T/m<)C a is given. In column 1 V. 

 the value of A. In column Y. the value of R, the range ob- 

 served from experiments, ami in column VI., R(pbs,)/A. 



