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+//chapter 2

+//example 2.4

+//calculate lattice constant

+//page 42

+clear;

+clc;

+//given

+N=6.02E26; // in /Kg-atom (Avogadro's number)

+n=2; // number of molecules per unit cell for bcc lattice

+M=6.94; // in Kg/Kg-atom (atomic weight of Iron)

+p=530; // in Kg/m^3 (density)

+//calculate

+a=nthroot((n*M/(N*p)),3);

+printf('\nThe lattice constant is\ta=%1.3E m',a); 

+a=a*1E10; // changing unit to Angstrom

+printf('\n\t\t\ta=%.3f Angstrom',a);