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clear;
clc;
printf("\nEx1.20\n");
//page no.-33
//given
a=2.9*10^-10;......//lattice constant in m
M=55.85;........//atomic wt. of Ge
N=6.02*10^26;....//avagadro no.
rho=7870;........//density in Kg/m^3

n=(a^3*rho*N)/M........//no. of atoms per unit cell

printf("\nNo. of atoms per unit cell is 2 \n");