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As radioactive substances undergo continuous decay, number of nuclei in a sample goes on decreasing. The time interval in which number of nuclei in a sample is reduced to half of its initial value is the half-life of the sample. The half-life is related to the decay constant by the relation. T_(1//2) = (0.693)/lambda The average life of a sample is expressed by the relation tau = 1/lambdaIf the half-life of a radioactive sample is 138.6 days, then mean life of the sample is |
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Answer» 199.58 DAYS |
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