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//Example number 4.10, Page number 70
clc;clear;
close;
//Variable declaration
n=1; //order
h=1;
k=1;
l=1;
e=1.6*10**-19; //charge(c)
V=5000; //voltage(V)
m=9.1*10**-31; //mass(kg)
H=6.625*10**-34; //plank constant
d=0.204*10**-9; //interplanar spacing(m)
//Calculation
lamda=H/sqrt(2*m*e*V); //wavelength(m)
theta=asin(n*lamda/(2*d)); //bragg's angle(radian)
theta=theta*180/%pi; //bragg's angle(degree)
//Result
printf("bragg''s angle is %.4f degree",theta)
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