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diff --git a/2825/CH18/EX18.4/Ex18_4.sce b/2825/CH18/EX18.4/Ex18_4.sce
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+//Ex18_4 Pg-946
+clc
+
+w=0.3*10^(-6)*100 //width of silicon in cm
+alpha=4*10^(4) 
+phi=10^(-2)
+e=1.6*10^(-19) //electron charge in eV
+
+disp("(1) Energy absorbed/sec is given by ")
+E=phi*(1-exp(alpha*w)) //energy absorbed(textbook answer is wrong)
+printf("                = %.1f mW \n",abs(E)*1e3)
+
+disp("(2) The portion of each photo energy that is converted into heat is obtained as hv-Eg/hv")
+Heat=(3-1.12)/3*100 //photon energy coverted to heat
+printf("                = %.0f %%",Heat)
+E1=(62/100)*0.0232 //energy dissipated/sec (textbook answer is wrong)
+printf("\n Obviously, the amount of energy dissipated/sec to lattice \n is %.1f mW \n",E1*1e3)
+
+disp("(3) Number of photons/sec from recombination is")
+num_photons=2.4/(e*1.12)
+printf("                = %.1f*1e19 photon/sec \n",num_photons*1e-19)
+//textbook answer is wrong
+
+disp("Therefore recombination radiation")
+RR=abs(E)-E1 //recombination radiation (textbok answer is wrong)
+printf("                = %.1f mW",RR*1e3)