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At a given instant there are 25 undecayed radioactive nuclei in a sample After 10...

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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 Question Type Single Correct Type 1 14 43 sec 2 7 21 sec 3 5 sec

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