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+//Example 5_11
+clc();
+clear;
+//To find the wavenength and energy
+n=4
+a=107.87    //units in amu
+N=10500
+row=6.052*10^26
+a=((n*a)/(N*row))^(1/3)*10^10  //units in A
+h=1
+k=1
+l=1
+d=a/sqrt(h^2+k^2+l^2)   //units in A
+theta=19.      //units in degrees
+lamda=2*d*sin(theta*%pi/180)     //units in A
+printf("Wavelength is lamda=%.2fA",lamda)
+lamda=lamda*10^-10   //units in meters
+
+h=6.625*10^-34  //Plancks constant
+c=3*10^8      //units in meter/sec
+energy=(h*c)/(lamda*1.6*10^-19)   //units in eV
+printf("\n energy is =%d eV",energy)