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//Example number 4.4, Page number 67
clc;clear;
close;
//Variable declaration
n=1; //order
lamda=3*10**-10; //wavelength(m)
h=1;
k=0;
l=0;
theta=40; //angle(degree)
//Calculation
theta=theta*%pi/180; //angle(radian)
d=n*lamda/(2*sin(theta)); //space of plane(m)
a=d*sqrt(h**2+k**2+l**2);
V=a**3; //volume of unit cell(m**3)
//Result
printf("space of plane is %.4f Angstrom",d*10**10)
printf("\n volume of unit cell is %.3e m**3",V)
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