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1 files changed, 6 insertions, 6 deletions
diff --git a/3428/CH19/EX12.19.4/Ex12_19_4.sce b/3428/CH19/EX12.19.4/Ex12_19_4.sce
index 499084179..478802d9f 100644
--- a/3428/CH19/EX12.19.4/Ex12_19_4.sce
+++ b/3428/CH19/EX12.19.4/Ex12_19_4.sce
@@ -1,12 +1,12 @@
//Section-12,Example-4,Page no.-SS.59
//To calculate concentration of holes and electrons in an n-type silicon.
clc;
-C_n=0.1
-e=1.6*10^-19
-u_e=1300
-N_D=C_n/(e*u_e)
-n=N_D
-n_i=1.5*10^10
+C_n=0.1 //(ohm-cm)^-1
+e=1.6*10^-19 //Coulombs
+u_e=1300 //cm^2/Vsec
+N_D=C_n/(e*u_e) //atoms/cm^3
+n=N_D //electrons/cm^3
+n_i=1.5*10^10 //per cm^3
disp(n,'Concentration of electrons(per cm^3)')
p=((n_i)^2)/n
disp(p,'Concentration of holes(per cm^3)')