\(N = \frac{{{N_0}}}{{{2^{\frac{t}{{{t_1}/2}}}}}}\,\,\,\, \Rightarrow \,\,\,\frac{N}{{{N_0}}} = \frac{1}{{10}} = \frac{1}{{{2^{\frac{t}{{10}}}}}}\)
\(10\,\, = \,\,{2^{t/10}};\,\,\,\,\,\ell {n_2}\,10 = t/10\,\)
\(3.3\,\, \times \,\,10\,\, = \,\,t\,\, = \,\,33\) દિવસો