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+// Scilab Code Ex11.1: Page-249 (2010)
+h = 6.626e-034;    // Planck's constant, Js
+c = 3e+08;    // Speed of light in free space, m/s
+k = 1.38e-023;    // Boltzmann constant, J/K
+T = 300;    // Temperature at absolute scale, K
+lambda = 5500e-010;    // Wavelength of visible light, m
+rate_ratio = exp(h*c/(lambda*k*T))-1;    // Ratio of spontaneous emission to stimulated emission
+printf("\nThe ratio of spontaneous emission to stimulated emission for visible region = %1.0e", rate_ratio);
+lambda = 1e-02;    // Wavelength of microwave, m
+rate_ratio = exp(h*c/(lambda*k*T))-1;    // Ratio of spontaneous emission to stimulated emission
+printf("\nThe ratio of spontaneous emission to stimulated emission for microwave region = %6.4f", rate_ratio);
+
+// Result
+// The ratio of spontaneous emission to stimulated emission for visible region = 8e+037
+// The ratio of spontaneous emission to stimulated emission for microwave region = 0.0048
+\ No newline at end of file