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+//Chapter-3,Example 5,Page 57
+clc;
+close;
+
+//Part (a)
+
+t_half= 1620  //half life of radium
+
+lamda= 0.693/t_half 
+
+//as radium lose one centigram mass
+
+N_0=100 // in centigram
+
+N_1=N_0-1
+
+t_1=log10(N_0/N_1)/(lamda*log10(%e))
+
+printf('Part (a)---total number of years required are %.2f years ',t_1)
+
+// Part (b)
+
+N_2= 1
+
+t_2=log10(N_0/N_2)/(lamda*log10(%e))
+
+printf('\n Part (b)---total number of years required are %.2f years ',t_2)