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+// Scilab Code Ex5.1 :Page-167 (2013)
+clc; clear;
+N_A = 6.022e+23;    // Avogdaro's No., per mole
+n = 1;    // Order of diffraction
+M = 58.5;    // Molecular mass of NaCl, g/mol
+rho = 2.16;    // Density of rock salt, g/cc
+two_theta = 20;   // Scattering angle, degree 
+theta = two_theta/2;    // Diffraction angle, degree
+N = N_A*rho*2/(M*1e-006); // Number of atoms per unit volume, per metre cube   
+d = (1/N)^(1/3);  // Interplanar spacing of NaCl crystal, m 
+lambda = 2*d*sind(theta)/n ;    // Wavelength of X-rays using Bragg's law, m
+printf("\nThe wavelength of the incident X rays  = %5.3f nm", lambda/1e-009);
+
+// Result
+// The wavelength of the incident X rays  = 0.098 nm