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+//chapter 2

+//example 2.3

+//calculate lattice constant

+//page 41-42

+clear;

+clc;

+//given

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

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

+M=55.85; // in Kg/Kg-atom (atomic weight of Iron)

+p=7860; // 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);