50 



TABLE 26.— GENERAL PHYSICAL CONSTANTS ACCORDING TO BIRGE 



(concluded) 



Mass of atom of unit atomic weight, 



Mo=l/No = (1.66035 ± 0.00031) X 10" 24 g 

 Mass of electron ; 



m = e/(e/m) = (F/No)/(e/m) = (9.1066o ± 0.0032) X 10" 28 g 



Mass of H l atom M„\ = H'/No = (1.67339 3 ± 0.0031) X 10" 24 g 



Mass of proton M P = (H 1 — E)/N = (1.67248, ± 0.00031) X 10- 24 g 



Ratio mass H 1 atom to mass electron : 



M»l/m = (e/m) (H x /F) = 1837.5c, ± 0.5. 



Ratio mass proton to mass electron : 



M P /m = (e/m) ( (H ^~ £) ) = 1836.5a, ± 0.5 6 



First radiation constant c,** = 8vhc = (4.9908 ± 0.0024) X 10 1S erg cm 



= he 2 = (0.59542 ± 0.0024) X 10" 5 erg cm 2 sec" 1 

 = 2irhc 2 = (3.7403 ± 0.0024) X 10 5 erg cm 2 sec" 1 

 Second radiation constant : 



T a c 2 ( 2w 2 F 6 ~) i/3 

 Cl = hc/k = -^j- 1 _ .,,. , , V = 1 .4384 8 ± 0.0003, cm deg 



Specific charge of o-particle : 



2F 



2e/M a = „ o C = 4822.3 3 ± 0.5, abs emu/g 



He — Lh. 



Specific charge of proton : 



e/Mp = H f_ E = 9578.7 7 ± 1.0 abs emu/g 



Radiation density constant, 



a = 87r°k l /(lSc*h 3 ) = 



(VoA \ * 4ir s NoRx,(c/m) ,_ . , n . _ _ A . . . . 1A « , , 



~TT/ \Sc*F* = (7 - 569 " °- 004 ») X 10 " erg cm" 3 deg" 4 



Stefan-Boltzmann constant : t 



,A 1 KL4//1C 273N _/VoAo\* ifN »R a (e / m) 



'=-^/4= 2^/(15^-) -\rrr) wcy 



= (5.672 83 ± 0.003,) X lO" 8 erg cm" 2 deg" 4 sec' 1 



Wien's displacement-law constant A = <r 2 /4.965114 = 0.28971 8 ± 0.00007 cm deg 



Wavelength associated with 1 abs volt : 



X = \0-*e 2 (h/e>) = J£ { R jjK^ e/m) } 1/3 = (12395. ± 2,) X 10" 8 cm abs volt 



Wave number associated with 1 abs volt : 



So — l/\o = — y i o~TEi — f = 8067.4, ± 1.4 cm/abs volt 



Zeeman displacement per gauss (e/m) /(Ave) =4.6699, ±0.0013) X 10" 5 cm/gauss 



** J y may be defined in several ways and this determines the value of C\. If J x d\ gives the energy 

 density of unpolarized radiation in range d\, then r, = fSirhc. If 7„dX gives the emission of linearly 

 polarized light, in range rf\ per unit solid angles perpendicular to the surface, then C\ = he 2 . If this 

 expression J^dX denotes the emission of radiation in range d\, per unit surface from one side in all 

 directions (2ir solid angle) then c % = 2vhc 2 . See Table 53. 



t For 2ir solid angle. 



Part 5. — Birge's 1944 values of 3 constants 



e, Electronic charge = (4.8021 ± 0.0006) X 10' 10 abs esu 



N v , Avogadro number = (6.02338 ± 0.00043) X 10 23 molecules mole" 1 



(chemical scale) 

 F, Faraday constant = 96487.7 ± 10 abs coul 



(chemical scale) 



SMITHSONIAN PHYSICAL TABLES 



