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diff --git a/3537/CH6/EX6.5/Ex6_5.sce b/3537/CH6/EX6.5/Ex6_5.sce
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+//Example 6_5
+clc();
+clear;
+//To find the relative population of the states in Ruby laser
+h=6.626*10^-34
+v=3*10^8  //units in met/sec
+kb=1.381*10^-23  //units in J/L
+t=300   //units in K
+n_no=exp((h*v)/(kb*t))
+printf("The relative population of two states is N/N0=")
+disp(n_no)
+//In textb book answer is printed wrong as 8*10^31 correct answer is 1.000048 
diff --git a/3537/CH6/EX6.5/Ex6_5.txt b/3537/CH6/EX6.5/Ex6_5.txt
new file mode 100644
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+The relative population of two states is N/N0=  1.000048  
+ 
+\ No newline at end of file