396 
APPENDIX I 
If electric potential ( X ), wave-length (A), temperature ( T ) and electron 
velocity (F) and energy (IF) are connected by 
eX = he I A = § RT = |mF 2 = IF, 
we have the relations 
5 volts = 2468 Angstroms = 38,650 degrees = 1-329.10 8 cm. per sec. 
= 7-95.10 -12 ergs. 
1293 volts = 9-54 Angstroms = 10,000,000 degrees = 2-138.10 9 cm. per sec. 
= 2-058.10- 9 ergs.