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PROBLEM:
How many times longer than the mean life of an extremely unstable atomic nucleus is the lifetime of a human? (Hint: The lifetime of an unstable atomic nucleus is on the order of 10-22 s .)
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SOLUTION:
The lifetime of a human is 2×109 s, while the lifetime of an unstable atomic nucleus is 10-22 s.
Therefore, a human lifetime is much longer by
\frac{T_h}{T_n}=\frac{2\times 10^9\:\text{sec}}{10^{-22}\:\text{sec}}=2\times 10^{31}\:\text{times}\ \qquad \ \color{DarkOrange} \left( \text{Answer} \right)
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