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diff --git a/3636/CH10/EX10.4/Ex10_4.sce b/3636/CH10/EX10.4/Ex10_4.sce
new file mode 100644
index 000000000..312889b1a
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+++ b/3636/CH10/EX10.4/Ex10_4.sce
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+clc;
+clear;
+Na=5*10^16 //in cm^3
+Nd=5*10^16 //in cm^3
+Dn=25 //in cm^2/s
+Dp=10 //in cm^2/s
+tau_n0=6*10^-7 //in s
+tau_p0=2*10^-7 //in s
+VR=6 //in V
+GL=5*10^20 //in cm^-3/s
+ni=1.5*10^10 //in cm^-3
+e=1.6*10^-19 //in Joules
+epsilon_s=11.7*8.85*10^-14 //in F/cm
+Const=0.026 //constant for KT/e in V
+
+//Calculation
+Ln=sqrt(Dn*tau_n0) //in mico-m
+Lp=sqrt(Dp*tau_p0) //in micro-m
+Vbi=Const*log((Na*Nd)/ni^2) //in V
+W=(((2*epsilon_s)/e)*((Na+Nd)/(Na*Nd))*(Vbi+VR))^0.5 //in micro-m
+JL=e*GL*(W+Ln+Lp) //photocurrent density
+
+mprintf("steady-state photocurrent density= %0.2f A/cm^2",JL)