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diff --git a/1694/CH6/EX6.9/Ex6_9.sce b/1694/CH6/EX6.9/Ex6_9.sce
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+++ b/1694/CH6/EX6.9/Ex6_9.sce
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+clear;
+clc;
+printf("\nEx-6.9\n");
+//page no.-188
+//given
+no=2.54*10^28;.....//no. of free e per unit volume of sodium
+e=1.6*10^-19;......//charge in C
+m=9.1*10^-31;....//mass of electron
+
+h=6.625*10^-34;....//planck's constant in Js
+
+E=(3*no/%pi)^(2/3)*(h^2)/(8*m*e)......//fermi energy in eV
+//to convert in J multiply by charge e i.e. 1.6*10^-19
+
+printf("\nfermi energy is 3.19 eV");