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+
+// Ex4_25
+clc;
+// Given:
+a=(1/32);// activity drop of its initial value
+t1=7.5;//in h case(a)
+t2=64.45;// in min case(b)
+// Solution:
+n=log(a)/log(0.5);
+t11=t1/n;// half life
+t12=t2/n;// half life
+printf("The half life for case (a)is %f h and case(b) is %f min",t11,t12)