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//Chapter-3,Example 1,Page 56
clc;
close;
M_0=200 //mass of radium
total_time= 8378-1898 //in years
//since t-half for radium is 1620 years
t_half=6480/1620 // number of half lives
m_left=M_0*(1/2)^t_half //mass of radium left
printf('mass of radium left after 6480 years is %.1f mg',m_left)
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