1.

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

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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 reduces to 6.25%, the mean life of the nuclei is



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