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//Chapter-3,Example 6,Page 58
clc;
close;
M = 214 // molecular mass of RaB
lamda= 4.31*10^-4
//since -(dN/dt)= lamda*N =3.7 *10^10
//N = m * 6.023*10^23/ M
m=(3.7*10^10)*214/(lamda*6.023*10^23)
printf('the mass of RaB is ')
disp(m)
printf(' gram')
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