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diff --git a/1694/CH1/EX1.8/Ex1_8.sce b/1694/CH1/EX1.8/Ex1_8.sce
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+clear;
+clc;
+printf("\nEx1.8\n");
+//page no.-11
+//given
+rho=7870;.........//densitynof alpha iron in kg/m^3
+N=6.02*10^26;.....//avagadro no.
+n=2;..............//number of molecules per unit cell for B.C.C.
+M=55.8;..........//atomic weight
+
+a=((n*M)/(N*rho))^(1/3).........//lattice constant in metre
+
+printf("\nlattice constant is 2.86 Angstrom\n");