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+// Scilab code Ex1.11:  Pg:36 (2008)
+clc;clear;
+h = 6.62e-034;    // Planck's constant, joule-sec
+c = 3e+08;    // Velocity of light, m/s
+m = 9.13e-031;    // Mass of an electron, kg
+e = 1.6e-019;    // Charge of electron, coulomb
+V = 18000;    // Potential difference applied between cathode and anode, volts
+E = e*V;    // Energy of the electron, joule
+// Since energy of X-rays is equal to energy of the electron thus
+// h*c/Lambda = e*V, solving for Lambda
+Lambda = h*c/E;    // Wavelength of X-rays, angstorm
+printf("\nThe shortest wavelength of X-rays in an X-ray tube = %4.2f angstorm", Lambda/1e-010);
+
+// Result 
+// The shortest wavelength of X-rays in an X-ray tube = 0.69 angstorm 
+\ No newline at end of file