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diff --git a/2939/CH4/EX4.30/Ex4_30.sce b/2939/CH4/EX4.30/Ex4_30.sce
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+
+// Ex4_30
+clc;
+// Given:
+t=2.6;// years
+// Solution:
+k=0.693/t;// decay constant
+//part(a)
+kbeta=0.89*k;
+printf("\n The decay constant is %f y^-1",kbeta)
+kEC=0.11*k;
+printf("\n The decay constant is %f y^-1",kEC)
+//part(b)
+tbeta=0.693/kbeta;
+printf("\n The half life is %f y",tbeta)
+tEC=0.693/kEC;
+printf("\n The half life is %f y",tEC)