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+//Example 27_11
+clc();
+clear;
+//To find the activity of sr
+t1=28 //units in Years
+t1=t1*86400*365 //Units in sec
+acti=6.022*10^26 //Units of Bq
+m1=90 //Units in Kg
+m2=0.001 //Units in Kg
+N=(m2/m1)*acti //Units in constant
+activity=0.693*N/t1 //Units in Bq
+printf("The activity of sr=")
+disp(activity)
+printf("Bq")