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diff --git a/3717/CH4/EX4.4/Ex4_4.sce b/3717/CH4/EX4.4/Ex4_4.sce
new file mode 100644
index 000000000..6520ed908
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+++ b/3717/CH4/EX4.4/Ex4_4.sce
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+// Ex4_4 Page:64 (2014)
+clc;clear;
+c = 3e+08;    // Speed of the electron, m/s
+lambda = 4000e-010;    // Wavelength of the spectral line, m
+delta_t = 1e-08;    // Average lifetime of an excited atomic state, s
+delta_lambda = lambda^2/(4*%pi*c*delta_t);    // Natural width of the spectral line, m
+printf("\nThe natural width of the spectral line = %4.2e m", delta_lambda);
+
+// Result 
+// The natural width of the spectral line = 4.24e-015 m
+\ No newline at end of file