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At a given instant, there are 25% undeca...

At a given instant, there are `25%` undecayed radio-active nuclei in a sample. After `8 sec`, the number of undecayed nuclei reduced to `12.5%`. The time after which the number of undecayed unclei will further reduce to `6.25%` of the reduced number is ______sec

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To reduced by half number the time required`=` one half life`=8 sec`
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