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+clear;
+clc;
+
+// A Textbook on HEAT TRANSFER by S P SUKHATME
+// Chapter 3
+// Thermal Radiation
+
+// Example 3.2
+// Page 115
+printf("Example 3.2, Page 115 \n\n")
+
+//Heat emission
+Stefan_constt = 5.67*10^(-8);    //(W/m^2.K^4)
+T = 1500;                          //temperature is in kelvins
+eb = (Stefan_constt)*(T^(4));          //energy radiated by blackbody
+//emission in 0.3um to 1um
+e = 0.9;                       //emissivity
+lamda1 = 1;                    //wavelength is in um
+lamda2 = 0.3;                  //wavelength is in um
+D0_1=0.5*(0.01972+0.00779);     //From table 3.1 page- 114
+D0_2=0;                        //From table 3.1 page- 114
+q = e*(D0_1-D0_2)*Stefan_constt*T^(4);//in W/m^2
+printf("\n wavelength*temp = %d um K",1*1500);
+printf("\n wavelength*temp at 0.3um = %d um K",0.3*1500);
+printf("\n\n Required heat flux, q = %d W/m^2",q);
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