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+// Ex2_4 Page:33 (2014)
+clc; clear;
+h = 6.626e-034; // Planck's constant, Js
+c = 3e+08; // Speed of light, m/s
+lambda = 0.2e-09; // Wavelength of photon, m
+p = h/lambda; // Momentum of the photon, kgm/s
+m = p/c; // Effective mass of photon, kg
+printf("\nThe momentum of the photon = %3.1e kg-m/s", p);
+printf("\nThe effective mass of photon = %3.1e kg", m);
+
+// Result
+// The momentum of the photon = 3.3e-24 kg-m/s
+// The effective mass of photon = 1.1e-32 kg
+