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clear;
clc;
printf("\nEx1.31\n");
//page no.-38
//given
n=1;..........//order
theta=34;....//angle in degrees
h=2;
k=0;
l=2;
lambda=1.5*10^-10;......//wavelength in m
//By bragg's law
d=(n*lambda)/(2*sind(theta))......//interplanar spacing in m
a=d*sqrt(h^2+k^2+l^2).............//lattice constant in m
printf("\nlattice constant is 3.773 angstrom \n");
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