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diff --git a/3020/CH16/EX16.10/ex16_10.sce b/3020/CH16/EX16.10/ex16_10.sce
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+clc;
+clear all;
+e = 1.6e-19; // Charge of an electron
+m = 9.11e-31; // Mass of an electron in Kg
+r = 1.6e-8 ; // resistivity of silver in (ohm.meter)
+at = 107.9e-3; // Atomic weight of copper in gm
+d = 10.5e3; // Density of silver in Kg per cubic meter
+N = 6.023e23; // Avagadros number
+c = 3e8 ;// Velocity of light in air
+fe= 5.5*e // Fermi energy of the silver piece
+E = 100;// Electric field
+sigma = 1/r; // Conductivity
+n = (N*d)/at; 
+tr = (sigma*m)/(n*e^2);// Relaxation time
+lambda = c*tr; // Mean free path
+vd = (sigma*E)/(n*e);// Drift velocity
+disp('s',tr,'Relaxation time is')
+disp('m',lambda,'Mean free path is')
+disp('m/s',vd,'Drift velocity of electrons')