1 files changed, 18 insertions, 0 deletions
diff --git a/1535/CH6/EX6.9/Ch06Ex9.sci b/1535/CH6/EX6.9/Ch06Ex9.sci
new file mode 100755
index 000000000..95ea7edab
--- /dev/null
+++ b/1535/CH6/EX6.9/Ch06Ex9.sci
@@ -0,0 +1,18 @@
+// Scilab Code Ex6.9 : X-ray Diffraction by crystal planes: Page-137 (2010)
+// For (221) planes
+h = 2; k = 2; l = 1; // Miller Indices for planes in a cubic crystal
+a = 2.68e-010;    // Interatomic spacing, m
+n = 1;    // First Order of diffraction 
+theta = 8.5;    // Glancing angle at which Bragg's reflection occurs, degrees
+d = a/(h^2+k^2+l^2)^(1/2);  // The interplanar spacing for cubic crystal, m
+lambda = 2*d*sind(theta);    // Bragg's Law for wavelength of X-rays, m
+n = 2;    // Second order of diffraction
+theta = asind(n*lambda/(2*d));    // Angle at which second order Bragg reflection occurs, degrees
+printf("\nThe interplanar spacing between consecutive (221) planes = %5.3e", d);
+printf("\nThe wavelength of X-rays = %5.3f angstrom", lambda/1e-010);
+printf("\nThe angle at which second order Bragg reflection occurs = %4.1f degrees", theta);
+
+// Result
+// The interplanar spacing between consecutive (221) planes = 8.933e-011
+// The wavelength of X-rays = 0.264 angstrom
+// The angle at which second order Bragg reflection occurs = 17.2 degrees 
+\ No newline at end of file