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diff --git a/2465/CH3/EX3.4/Examlpe_4.sce b/2465/CH3/EX3.4/Examlpe_4.sce
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+//Chapter-3,Example 4,Page 57
+clc;
+close;
+
+m=234  // atomic mass of uranium
+
+M_0 = 4   // initial mass of uranium
+
+t_half= 2.48*10^5  // half life of uranium 
+
+t= 62000*365*24*3600  // time period
+
+lamda=8.88*10^-14
+
+M= M_0*exp(-lamda*t)
+
+printf('Mass of uranium left unchanged is %.3f mg', M)
+
+N= (M*6.023*10^20)/m
+
+A= lamda*N
+
+printf(' \n activity of uranium is %.3f disintigrations/sec ', A)