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//Example 5_9
clc();
clear;
//To determine the interplanar spacing
h=6.63*10^-34 //Plancks Constant
m=9.1*10^-31
e=1.6*10^-19
v=844
lamda=h/sqrt(2*m*e*v) //units in mts
n=1
theta=58 //units in degrees
d=(n*lamda)/(2*sin(theta*(%pi/180))) //units in mts
printf("The interplanar spacing d=")
disp(d)
printf("mts")
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