\(\frac{{{H_t}}}{{{H_0}}} = 0,63 \Rightarrow \frac{{{N_t}}}{{{N_0}}} = 0,63 \Rightarrow \frac{{{m_t}}}{{{m_0}}} = 0,63 \Rightarrow \frac{{{m_0}{{.2}^{ - \frac{t}{T}}}}}{{{m_0}}} = 0,63\)
\( \Rightarrow {2^{ - \frac{t}{T}}} = 0,63 \Rightarrow {2^{ - \frac{t}{{5730}}}} = 0,63 \Rightarrow t = 3819,5\)(năm)
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