For a certain radioactive substance, it is observed that after \( 4 \mathrm{~h} \), only \( 6.25...

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For a certain radioactive substance, it is observed that after \( 4 \mathrm{~h} \), only \( 6.25 \% \) of the original sample is left undecayed. It follows that
(1) the half-life of the sample is \( 1 \mathrm{~h} \)
(2) the mean life of the sample is \( \frac{1}{\ln 2} \mathrm{~h} \)
(3) the decay constant of the sample is \( \ln (2) \mathrm{h}^{-1} \)
(4) after a further \( 4 \mathrm{~h} \), the amount of the substance left over would by only \( 0.39 \% \) of the original amount
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