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diff --git a/1571/CH12/EX12.3/Chapter12_Example3.sce b/1571/CH12/EX12.3/Chapter12_Example3.sce
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+clc
+clear
+
+//INPUT
+r1=60;//distance of first black body in cm
+r2=30;//distance of second black body in cm
+t1=873;//temperature of first black body in K
+t2=573;//temperature of the second black body in K
+
+//CALCULATIONS
+i=(t2^4/t1^4)*(r1^2/r2^2);//ratio of intensity of radition
+
+//OUTPUT
+mprintf('ratio of intensity of radition is %3.2f',i)