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diff --git a/1787/CH2/EX2.9/Exa2_9.sce b/1787/CH2/EX2.9/Exa2_9.sce
new file mode 100755
index 000000000..9fa7928aa
--- /dev/null
+++ b/1787/CH2/EX2.9/Exa2_9.sce
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+//Exa 2.9
+clc;
+clear;
+close;
+//given data
+SIGMAi=2.12766;//in S/m
+RHOi=0.47;//in ohm-m
+MUh=0.19;//in m^2/V-s
+MUe=0.39;//in m^2/V-s
+e=1.6*10^-19;//in coulamb
+//Formula : SIGMAi=ni*e*(MUe+MUh)
+ni=SIGMAi/(e*(MUe+MUh));//in m^-3
+E=10^4;//in V/m
+vn=MUe*E;//in m/s
+vh=MUh*E;//in m/s
+disp(ni,"Density of electron in intrinsic material in m^-3 : ");
+disp(vn,"Drift velocity for electrons in m/s : ");
+disp(vh,"Drift velocity for holes in m/s : ");
+\ No newline at end of file