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+// Scilab code Exa4.2 : : Page 178 (2011)
+clc; clear;
+V = 0.8/4;    // Pulse height, volt
+e = 1.60218e-019;     // Charge of an ion, coulomb
+C = 0.5e-012;     // Capacity of the collector, farad
+Q = V*C;    // Total charge produced, coulomb
+N = Q/e;     // Number of ion pairs 
+E_1 = 35;    // Energy of one ion pair, electron volt
+E = N*E_1/10^6;    // Energy of the alpha particles, mega electron volt
+printf("\nThe energy of the alpha particles = %4.3f MeV", E);
+
+// Result
+// The energy of the alpha particles = 21.845 MeV (The answer is wrong in the textbook)
+\ No newline at end of file