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diff --git a/3717/CH15/EX15.2/Ex15_2.sce b/3717/CH15/EX15.2/Ex15_2.sce
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index 000000000..34b9bdcda
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+++ b/3717/CH15/EX15.2/Ex15_2.sce
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+// Ex15_2 Page:298 (2014)
+clc;clear;
+h = 6.626e-034;    // Planck's constant, Js
+c = 3e+008;    // Speed of light in vacuum, m/s
+t = 30e-003;    // Pulse width of laser, s
+P = 0.6;    // Output power of laser per pulse, W
+lambda = 640e-009;    // Wavelength of laser light, m
+E = P*t;    // Energy deposited per laser pulse, J
+n = E*lambda/(h*c);    // Number of photons in each laser pulse
+printf("\nThe energy deposited per laser pulse = %5.3f J", E);
+printf("\nThe number of photons in each pulse = %3.1e", n);
+
+// Result
+// The energy deposited per laser pulse = 0.018 J
+// The number of photons in each pulse = 5.8e+016 
+\ No newline at end of file