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 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 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 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 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 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 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 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.

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 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