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--- a/2465/CH3/EX3.5/Ex3_5.sce
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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)