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diff --git a/2939/CH4/EX4.28/Ex4_28.sce b/2939/CH4/EX4.28/Ex4_28.sce
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+
+// Ex4_28
+clc;
+
+// Given:
+t=14.3;// half life in days
+// Solution:
+k=0.693/(t*24*3600);
+N=(3.7*10^10)/(k);// No. of atoms in 1 Ci
+N1=N*(1-(exp(-0.693/14.3)));// atoms of S32 produced
+mass=(N1*32)/(6.022*10^23);
+
+m1=mass*10^6;// in micro grams
+printf("The mass in micro-grams is %f.",m1)
+