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+// Scilab Code Ex3.16: Page-116 (2013)

+clc; clear

+c = 2.998e+008;    // Speed of light in vacuum, m/s

+h = 6.626e-034;    // Planck's constant, Js

+m_e = 9.11e-031;    // Rest mass of an electron, kg

+lambda = 0.050;    // Wavelength of the X-ray, nm

+theta = 180;    // The angle at which the recoil electron Ke becomes the largest, degree

+E_x_ray = 1.240e+003/lambda;    // Energy of the X-ray, eV

+lambda_prime = lambda + (1-cosd(theta))*h/(m_e*c*1e-009);    // The largest wavelength of the scattered photon, nm

+E_prime_x_ray = 1.240e+003/lambda_prime;    // Energy of the scattered photon, eV

+K = (E_x_ray - E_prime_x_ray)/1e+003;    // Kinetic energy of the most energetic recoil electron, keV

+if (E_prime_x_ray < E_x_ray) then

+    printf("\nThe X-ray is Compton-scattered by the electron.");

+else

+    printf("\nThe X-ray is not Compton-scattered by the electron.");

+end

+printf("\nThe largest wavelength of the scattered photon = %5.3f nm", lambda_prime);

+printf("\nThe kinetic energy of the most energetic recoil electron = %3.1f keV", K);

+printf("\nThe angle at which the recoil electron energy is the largest = %d degrees", theta);

+

+// Result

+// The X-ray is Compton-scattered by the electron.

+// The largest wavelength of the scattered photon = 0.055 nm

+// The kinetic energy of the most energetic recoil electron = 2.2 keV

+// The angle at which the recoil electron energy is the largest = 180 degrees 
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