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diff --git a/2939/CH4/EX4.4/Ex4_4.sce b/2939/CH4/EX4.4/Ex4_4.sce
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+
+//Ex4_4
+
+clc;
+
+// Given:
+t1=12.3;// in yrs
+L=6.022*10^23;
+// Solution:
+k=.693/(t1*3.16*10^7);// in s^-1
+A=(2*L)/(2.24*10^4);// no. of atoms
+a1=A*k;// dis per s
+a=a1/(3.7*10^10);// activity in Ci/cm^3
+printf("The activity in Ci/cm^3 = %f",a)