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clear;
clc;
printf("\nEx1.21\n");
//page no.-33
//given
n=4;...........//no. of atoms per unit cell
M=63.5;........//atomic wt. of Ge
N=6.02*10^26;....//avagadro no.
rho=7860;........//density in Kg/m^3
r=0.1278*10^-9;....//atomic radius
a=8^(0.5)*r;.......//lattice constant in m
rho=(n*M)/(N*a^3)......//density in Kg/m^3
printf("\ndensity is 8938.66 Kg/m^3\n");
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