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diff --git a/1970/CH4/EX4.15/Ch04Exa15.sce b/1970/CH4/EX4.15/Ch04Exa15.sce
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+// Scilab code Exa4.15 : : Page 182 (2011)
+clc; clear;
+p = 100;        // Momentum of the particle, GeV
+n = 1+1.35e-04;    // Refractive index of the gas 
+m_0 = 1;         // Mass, GeV per square coulomb
+gama = sqrt((p^2+m_0^2)/m_0);     // Boost parameter
+bta = sqrt (1-1/gama^2);        // Relativistic parameter
+d_theta = 1e-003;    // Error in the emission angle, radian
+theta = acos(1/(n*bta));         // Emision angle of photon, radian 
+F_err = (p^2*n^2*2*theta*10^-3)/(2*m_0^2);        // Fractional error
+printf("\nThe fractional error in rest mass of the particle =  %4.2f", F_err);
+
+// Result 
+// The fractional error in rest mass of the particle =  0.13 
+\ No newline at end of file