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A sample of radioactive material A that has an activity of 10mCi has twice the...

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A sample of radioactive material A that has an activity of 10mCi has twice the number of nuclei as another sample of a different radioactive material B which has an activity of 20mCi The correct choice of half life of A and B would then be respectively 1 20 days and 5days 2 20 days and 10 days 3 5 days and 10 days 4 10 days and 40 days

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