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+// Scilab code Ex1.12:  Pg:37 (2008)
+clc;clear;
+Lambda = 1e-010;    // Wavelength of X-rays, cm
+c = 3e+08;    // Velocity of light, m/s
+m = 9.13e-031;    // Mass of an electron, kg
+h = 6.62e-034;    // Planck's constant, joule-sec
+e = 1.6e-019;    // Charge of electron, coulomb
+f = c/Lambda;    // Frequency of X-rays, cycles/sec
+E = h*f;    // Energy of X-ray photon, joule
+// Since energy of X-ray photon is converted into energy of electrons thus
+// h*f = (1/2)*m*v^2, solving for v
+v = sqrt(2*h*f/m);    // Velocity of the electron, m/s
+printf("\nThe energy of an electron beam = %5.0f eV", E/e);
+printf("\nThe velocity of an X-ray beam = %5.3e m/s", v);
+
+// Result 
+// The energy of an electron beam = 12413 eV
+// The velocity of an X-ray beam = 6.596e+007 m/s
+\ No newline at end of file