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+
+// Ex4_18
+clc;
+
+// Given:
+N1=10^24;// atoms
+N2=10^16;// atoms
+N3=1000;// atoms
+N4=80;// atoms
+
+// Solution:
+N11=N1*0.5;// 1st half life
+N12=N11/2;// 2nd half life
+N13=N12/2;// 3rd half life
+printf("\n The 1st half life, 2nd half life, 3rd half life are %f, %f, %f respectively.",N11,N12,N13)
+N21=N2/2;// 1st half life
+N22=N21/2;// 2nd half life
+N23=N22/2;// 3rd half life
+printf("\n The 1st half life, 2nd half life, 3rd half life are %f, %f, %f respectively.",N21,N22,N23)
+N31=N3/2;// 1st half life
+N32=N31/2;// 2nd half life
+N33=N32/2;// 3rd half life
+printf("\n The 1st half life, 2nd half life, 3rd half life are %f, %f, %f respectively.",N31,N32,N33)
+//Radiactivity is a statistical property. Decay kinetics are reliable only when initial number is large