what is the value of a and b in moseley equation square root of v =a(z-b) Share with your friends Share 0 P.priyanka answered this "a" is the proportionality constant, whereas "b" is the screening constant depending on spectral series. 5 View Full Answer Aviral Singh answered this Priyanka# i am asking for numerical value.... -3 P.priyanka answered this the numerical value depends on the element used in the experiment. 1 P.priyanka answered this when alpha particles or beta rays are used for the experiment b=1, a= the proportionality constant of the metal( varies for different metals) -1 Aviral Singh answered this okkk thanks p.priyanka -1