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+//Example 9.8, page 358
+clc
+//Energy of K shell
+z=26
+k=2
+E_k=13.6*(z-k)^2//in ev
+v=7.8*10^3//in V
+//for L shell
+l=10
+E_l=13.6*(z-l)^2//in ev
+h=E_k-E_l
+R_m=1.1*10^7
+x=R_m*(z-2)^2//x=1/lamda
+lambda=1/x
+printf("\n The wavelength is  %e  m",lambda)
+