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+// Scilab code Ex8.11: Determining the wavelength of diffracted X-rays Page 262 (2010)

+d = 2.814e-010;    // Interplanar spacing of rocksalt crystal, m

+theta = 9;    // Bragg's angle, degree

+// 2*d*sin(theta) = n*lambda    **Bragg's law, n is the order of diffraction

+// Solving for lambda, we have

+// lambda = 2*d*sin(theta)/n;

+printf("\nThe first four wavelengths of diffracted beam are:");

+for n = 1:1:5    // For diffraction order from 1 to 5

+    lambda = 2*d*sind(theta)/n;     // Wavelength of X-rays, m

+    if lambda >= 0.2e-010 & lambda <= 1.0e-010 then

+        printf("\nLambda%d = %6.4e angstrom", n, lambda/1D-10);

+    end

+end

+// Result

+// The first four wavelengths of diffracted beam are:

+// Lambda1 = 8.8041e-001 angstrom

+// Lambda2 = 4.4021e-001 angstrom

+// Lambda3 = 2.9347e-001 angstrom

+// Lambda4 = 2.2010e-001 angstrom
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