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+clc;clear;
+//Example 15.6
+//calculation of activity
+
+//given values
+t=28;//half life in years
+m=10^-3;//mass of sample
+M=90;//atomic mass of strontium
+NA=6.02*10^26;//avogadro's number
+
+
+//calculation
+n=m*NA/M;//no of nuclei in 1 mg sample
+k=.693/(t*365*24*60*60);//decay constant
+A=k*n;
+disp(A,'activity of sample(in disintegrations per second) is');
+\ No newline at end of file