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diff --git a/3411/CH6/EX6.6/Ex6_6.sce b/3411/CH6/EX6.6/Ex6_6.sce
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+++ b/3411/CH6/EX6.6/Ex6_6.sce
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+//Example 6_6
+clc();
+clear;
+//To calculate the ratio of stimulated emission to Spontaneous emission
+h=6.63*10^-34
+c=3*10^8
+lamda=694.3*10^-9
+kb=1.38*10^-23
+T=300
+constant=(h*c)/(lamda*kb*T)
+R=1/(exp(constant)-1)
+printf("The ratio of stimulated emission to Spontaneous emission is R=")
+disp(R)
+//In text book answer is given R=4.98*10^-14 but the correct answer is R=8.874D-31   
+\ No newline at end of file
diff --git a/3411/CH6/EX6.6/Ex6_6.txt b/3411/CH6/EX6.6/Ex6_6.txt
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+The ratio of stimulated emission to Spontaneous emission is R= 
+    8.874D-31  
+ 
+\ No newline at end of file