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diff --git a/1739/CH7/EX7.1/Exa7_1.sce b/1739/CH7/EX7.1/Exa7_1.sce
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+//Exa 7.1
+clc;
+clear;
+close;
+//Given data :
+format('v',10);
+lambda=1.5;//in um
+T=900;//in kelvin
+h=6.63*10^-34;//Planks contant
+c=3*10^8;//speed of light in m/s
+K=1.38*10^-23;//Boltzman Constant
+//Formula : StiEmissionRate/SponEmissionRate=1/(exp(h*F/(K*T))-1)=1/(exp(h*c/(K*T*lambda))-1)
+StiEmRateBySponEmRate=1/(exp(h*c/(K*T*lambda*10^-6))-1);
+disp(StiEmRateBySponEmRate,"Stimulated Emission Rate/Spontanious Emission Rate is : ");
+\ No newline at end of file