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+// Scilab Code Ex8.3:: Page-8.8 (2009)
+clc; clear;
+lambda = 7000;  // Wavelength of the Ruby laser, angstrom
+e = 1.6e-019;   // Energy equivalent of 1 eV, J/eV
+N = 2.8e+019;   // Total number of photons
+E = 12400/lambda;   // Energy of one emitted photon, eV
+E_p = E*e*N;    // Total energy available per laser pulse, joule
+
+printf("\nThe energy of one emitted photon = %4.2e J", E*e);
+printf("\nThe total energy available per laser pulse = %4.2f joule", E_p);
+
+// Result 
+// The energy of one emitted photon = 2.83e-19 J
+// The total energy available per laser pulse = 7.94 joule