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To investigate the beta-decay of Mg^(23)...

To investigate the beta-decay of `Mg^(23)` radionuclide, a counter was activated at the moment `t=0`. It registered `N_(1)` beta particles by a moment `t_(1)=2 sec`, and by a moment `t_(2)=3t_(1)` the number of registered beta particles was `2.66` times greater. the mean life of the given nuclei is

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The correct Answer is:
`[tau = 16 s]`
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