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//Example number 4.8, Page number 69
clc;clear;
close;
//Variable declaration
e=1.6*10**-19; //charge(c)
theta=56; //angle(degree)
V=854; //voltage(V)
n=1; //order of diffraction
m=9.1*10**-31; //mass(kg)
h=6.625*10**-34; //plank constant
//Calculation
theta=theta*%pi/180; //angle(radian)
lamda=h/sqrt(2*m*e*V); //wavelength(m)
d=n*lamda/(2*sin(theta))*10**10; //spacing of crystal(Angstrom)
//Result
printf("spacing of crystal is %.3f Angstrom",d)
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