At a given instant there are \( 25 \% \) undecayed radioactive nuclei in a sample. After 10 sec ...

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At a given instant there are \( 25 \% \) undecayed radioactive nuclei in a sample. After 10 sec the number of undecayed nuclei remains \( 12.5 \% \). Calculate :
\( \mathrm{P} \)
(i) mean-life of the nuclei and
W.
(ii) The time in which the number of undecayed nuclei will further reduce to \( 6.25 \% \) of the reduced number.
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