//Given that
Kalpha = 178.9*10^-12  //in m
Kimpure = 143.5*10^-12  //in m
Z = 27

//sample Problem 41-5
printf("**Sample Problem 41-5**\n")
Zx = sqrt(Kalpha/Kimpure)*(Z-1) + 1
printf("The proton number of the impurity is %d", Zx)