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diff --git a/3651/CH4/EX4.3/3.sce b/3651/CH4/EX4.3/3.sce
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+++ b/3651/CH4/EX4.3/3.sce
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+//Variable declaration
+d=970;    //density(kg/m**3)
+Na=6.02*10**26;    //avagadro number
+w=23;    //atomic weight
+m=9.1*10**-31;     //mass(kg)
+h=6.62*10**-34;     //planck's constant
+
+//Calculation
+N=d*Na/w;    //number of atoms/m**3
+x=h**2/(8*m);
+y=(3*N/%pi)**(2/3)
+EF=x*y;     //fermi energy(J)
+
+//Result
+printf('fermi energy is %0.3f  eV \n ',(EF/(1.6*10**-19)))