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clear
//
//
//
//Variable declaration
a1=5.43*10^-8; //lattice constant(cm)
M1=28.1; //atomic weight
N=6.023*10^23; //avagadro number
n1=8; //number of atoms
a2=5.65*10^-8; //lattice constant(cm)
M2=144.6; //atomic weight
n2=4; //number of atoms
//Calculations
rho1=n1*M1/(N*a1^3); //density of Si(gm/cm^3)
rho2=n2*M2/(N*a2^3); //density of GaAs(gm/cm^3)
//Result"
printf("\n density of Si is %0.2f gm/cm^3",rho1)
printf("\n density of GaAs is %0.3f gm/cm^3",rho2)
printf("\n answer in the book varies due to rounding off errors")
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