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The count rate of nuclear radiation coming from a radioactive sample containing 1281 varies with time as follows Time t(minute): Count rate R(x10 s-):

The count rate of nuclear radiation coming from a radioactive sample containing 1281 varies with time as follows Time t(minute): Count rate R(x10 s-): The mean life is 25 min 36 min 50 min 30 min 0 30 25 16 50 8.0 75 3.8 100 2.0

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