Table 43 105 



MISCELLANEOUS DERIVED PHYSICAL CONSTANTS 



Evaluated by Doctor Birge in Phys. Rev. Suppl., 1, I, 1929. 



(See notes on page 99.) 



Mass of electron (spectroscopic) 



nu, = e/\ c(c/w)sp \ = (9.03510 ± 0.010) X io" 28 g 

 Mass of electron (deflection) 



m = c/ 1 c(e/m)defl \ — (8.99425 ±0.014) X nr M g 

 Atomic weight of electron (spectroscopic) 



m = F/(e/tn)ap = (547922 ± 0.003) X io 4 

 Atomic weight of electron (deflection) 



m = F/(c/m)drfl = (5.454m ± 0.006) X IO" 4 



Mass of atom of unit atomic weight 



Mo — 1/N0 = (1.6489s ± 0.0016) X io 24 g 



Mass of hydrogen atom Mn = H/No = (i.66i~ 9 ± 0.0017) X io" 24 g 



Number of atoms per gram of hydrogen 



i/Mh = (6.oi7 6l ± 0.006) X io 23 g _1 



Mass of proton M P = (H — m)/N n = (1.66089 ±0.0017) X io" 24 g 



Mass of a particle. . . .Ma = (He — 2m) /No = (6.59774 ± 0.007) X io 24 g 

 Charge (electrolysis) of 1 g hydrogen 



c/Mu = F/H = (9574.51 ± 0.7) abs. cm-units • g" 1 

 Specific charge of proton 



c/Mp = F/(H — m) = (9579.73 ± 0.7) abs. cm-units • g" 1 

 Specific charge of a particle 



zc/Ma — 2F/(Hc — 2m) = (4823. ii ± 0.6) abs. cm-units g" 1 

 Ratio, mass H atom to mass electron (spec- 

 troscopic) (e/m)si>/(e/Mii) = 1839.2c ± 1 



Ratio, mass H atom to mass electron (deflec- 

 tion) (,c/m)defi/(c/Mn) = 1847.01 ± 2 



Ratio, mass proton to mass electron (spec- 

 troscopic) Mp/msp = 1839.26 — 1 = 1838.2* ± 1 



Ratio, mass proton to mass electron (deflec- 

 tion) Mp/mdcfi = 1847.61 — 1 = 1846.01 ± 2 



Energy associated with unit wave number 



e/f' = he— (1.962704 ± 0.0025) X io" 16 erg • cm 

 Potential (cs) associated with unit frequency 



V/v — h/e = (1.37254 ± 0.0005) X io" 17 cy-units • sec. 

 Frequency associated with 1 abs. volt 



v/V" = icfe/hc — (2.43025 ± 0.0009) X io 14 sec." 1 • abs. volt" 1 

 Wave number associated with 1 abs. volt 



v„ = v IV" — ioY//ir = (8106.31 ± 3) cm" 1 • abs. volt" 1 

 Wave length associated with 1 abs. volt 



X„ — \V" = hc 2 /e = ( 12336.1 ± 5) X io -8 cm ■ abs. volt 



Smithsonian Tables 



