The ultra-violet maximum of the selective photo-electric effect can he calculated by expressions given by the following authorities: Lubben, v ion = v undissolved salt + 2 Q/N h; Haber and Lewis, Q = N h (Σ v resultants - v reactants); Haber, vv/ v r = √M/m; Lindeman, Vv = √ n e2/m r3/π; where v =critical frequency in ultra-violet (v) or infra-red (r), N=Avogadro's constant, h =Planck's element of action, M=molecular weight of the substance, n =valency of atom to which electron belongs, e =charge on an electron, and r = ½ distance between two neighboring atoms. Substitution of known experimental values into the four formulae predicts the existence of a natural ultra-violet frequency of silver bromide in the neighborhood of 1900A.
Proceedings of the Iowa Academy of Science
©1923 Iowa Academy of Science, Inc.
Helmick, P. S.
"The Natural Ultra-Violet Frequency of Silver Bromide,"
Proceedings of the Iowa Academy of Science, 30(1), 75-76.
Available at: https://scholarworks.uni.edu/pias/vol30/iss1/16