﻿Absorption and Scattering of the a. Bays. 



911 



Table I. 



n is the number of electrons in the atom. 



a is the atomic radius. 



k is the parameter of the velocity curve. 



A.r' is the thickness of the film. 

 Aa\ is the equivalent in air at range 5-7 cm. 

 A.r 2 ,, ,, ,, 3 - 7 cm. 



Ax~ 3 „ ,, ,, 2-1 cm. 



For Al the change of equivalence is very slow and so the range 2*1 cm. was 

 used for the solution and the range 3*7 cm. for comparison. For H, 

 Ax x is at range 52 cm. and A.r 2 at range 4"0 cm. 



Data used for the solutions. 





Ax'. 



A.r r 



Ax 2 . 



A.r 3 (obs.). 



Ax 3 (calc). 



Au 



1-27X10- 4 



•719 



•657 



•600 



•570 



Pb 



2-84x10-* 



1-104 



•999 



•888 



•853 



Sn 



3-86x10-* 



1-011 



•957 



•882 



•877 



Al 



3-30x10-* 



•597 



•584 



•597 



•592 



H 



107 



•231 



•247 









Vol 



Lime Distribution. 



Surface Distributi 



on. 



Air < n. 

 [k. 



10- s 



7-4 



3-82 



10 -8-5 

 111 



2-82 



10- 9 

 19-2 

 1-82 



10- 8 



8-7 

 3-82 



10- 8'5 

 13-2 



2-82 



10- 9 

 22-7 

 1-82 



f(T. 



Au «j v. 



1 K. 



io-oxio- 10 



89 

 1-82 



8-8X10" 10 

 106 

 1-70 



69 XlO" 10 

 117 

 1-49 



6-2 XlO" 10 

 140 

 1-4.0 



4-0xl0" lu 

 182 

 101 



3.7 x 10-10 



215 

 •95 



9-OxlO- 10 

 113 

 1 72 



6-lxlO" 10 

 152 



1-38 



3-6X10" 10 

 230 

 •93 



f<7. 



Pb \ n. 



7-8X10" 10 

 137 

 1-61 



5-4X10" 10 



182 

 1-28 



33 XlO- 10 

 275 



•85 



Sn \ n. 



17-8X10- 10 

 48 

 2-32 



10-7X10- 10 

 65 



1-88 



5-3 XlO" 10 

 104 

 1-27 



166X10- 10 

 60 

 2-26 



9-7xl0~ 10 

 82 

 179 



5-OxlO" 10 

 128 

 1-21 



[a. 

 Al \ n. 



[k. 



6-7 XlO- 9 

 13-2 

 347 



2-5xl0~ 9 

 19-2 

 2 62 



090 XlO" 9 

 32-5 

 1-72 



4-3 X10~ 8 

 •99 

 5-1 



6-6xl0~ 9 

 15-5 

 3-46 



2-4X10- 9 

 231 

 2-60 



oesxio- 9 



38-8 

 1-70 



H [!• 



67X10" 8 



101 



5*5 



