Normal and Selective Photoelectric Effect. 157 



Tabl'e I. 

 2d atom, per cent. R ; 97*5 atom, per cent. Hg. <£ = 60°. 



No. 



Wave-length 

 pp. 



Photoelectric current. 



E|| 

 10 -13 arnp. 



10 _13 amp. 



95 



90 



92 



436 

 405 

 313 

 254 



0-45 

 5-0 

 52-5 



84-4 



0-13 

 14 



18-3 



32 



93 









Fig. L— K-Hg alloy; = 6O C 



>?0 







*u 



\ 





10 







& 







a 







<s 







« 60 



\ 





i 

 o 







5D 







-^> 







R 











V° 



1 »C 



. 



V 



o 



















"§ 3 o 



V 





QJ 







<D 



X 





O 







-M 







O 







-S ID 







Ah 







40 





- - i*0>0 — 



Wave-length, 



HOO 



