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+// Ex4_2 Page:59 (2014)
+clc;clear;
+e = 1.6e-019;    // Energy conversion factor, J/eV
+m = 9.1e-031;    // Mass of an electron, kg
+h = 6.626e-034;  // Planck's constant, Js
+c = 3e+08;    // Speed of light in vacuum, m/s
+// Non-relativistic case:
+E = 1;    // Kinetic energy of an electron, eV
+p = sqrt(2*m*E*e);    // Momentum of the electron, kg-m/s
+lambda = h/p*1e+09;    // de-Broglie wavelength of electron, nm
+printf("\nNon-relativistic Case:\nThe de-Broglie wavelength of electron = %3.1f nm", lambda);
+// Relativistic case:
+KE = 100;    // Kinetic energy of an electron, MeV
+p = KE*e/c*1e+06;    // Relativistic momentum of the electron, kg-m/s
+lambda = h/p;    // de-Broglie wavelength of electron, m
+printf("\nRelativistic case:\nThe de-Broglie wavelength of electron = %5.3e m", lambda);
+
+
+// Result 
+// Non-relativistic Case:
+// The de-Broglie wavelength of electron = 1.2 nm
+// Relativistic case:
+// The de-Broglie wavelength of electron = 1.242e-14 m