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//Example 5_3
clc();
clear;
//To determine the interplanar spacing
a=450 //units in nm
h=2
k=2
l=0
d220=a/sqrt(h^2+k^2+l^2) //units in nm
printf("Inter planar spacing d220=%.1f nm",d220)
//in text book the answer is printed wrong as 15.1 nm The answer is 159 nm
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