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clc//
//
//
//Variable declaration
lamda=1.5418; //wavelength(angstrom)
theta=30; //angle(degrees)
n=1; //first order
h=1;
k=1;
l=1;
//Calculation
theta=theta*%pi/180; //angle(radian)
d=n*lamda/(2*sin(theta));
a=d*sqrt(h^2+k^2+l^2); //interatomic spacing(angstrom)
//Result
printf("\n interatomic spacing is %0.2f angstrom",a)
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