At a given instant there are `25%` undecayed radioactive nuclei in a sample. After `10 s` the number of undecayed nuclei reduces to `12.5%`. Calculate
(a) mean life of the nuclei,
(b) the time in which the number of undecayed nuclei will further reduce to` 6.25%` of the reduced number.

At a given instant there are 25% undecayed ratio-activity nuclei in sample. After 10 second, the number of undecyed nuclei reduces to 12.5% . Calculate (a) mean-life of the nuclei and (a) the time in which the number undecayed nuclei will further reduce to 6.25% of the reduced number.

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 : (i) mean - life of the nuclei and (ii) The time in which the number of undecayed nuclears will further reduce to 6.25 % of the reduced number.

As a given instant there are 25% undercayed radio - active nucles in az sample . After 10 second the number of undecayed nucles reduces to 12.5% Calculate (i() mean - like of the nucleus, and (ii) the time in which the number of undecayed nuclei will further to 6.25 % of the reducted number .

At a given instant, there are 25% undecayed radioactive nuclei in a sample. After 10 seconds the number of undecayed nuclei reduces to 12.5%, the mean life of the nuclei is

At a given instant there are 25% undecayed rodioctive nuclei in sample After 10 s the number of undecyed nuclei reduces to 12.5 % calculate the mean life of the nuclei .

At a given instant there are 25 % undecayed radioactive nuclei in a same. After 10 sec the number of undecayed nuclei reduces to 6.25 % , the mean life of the nuclei is.

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

At a given instant there are 12.5% undecayed radioactive nuclei in a sample.After 25 seconds, it reduce to 6.25% whereby the number of undecayed nuclei becomes N .Further time in which this number reduces to 3.125% of N is n^(3) sec,then n=

At a given instant, 60% of the radioactive nuclei in a sample are left undecayed. After 20 s, 85% nuclei have disintegrated , mean life of nuclei