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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)