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The half life of a radioactive isotope X is 3 s. Initially there are 8000 atoms of this isotope in the sample

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The half life of a radioactive isotope X is 3 s. Initially there are 8000 atoms of this isotope in the sample. Calculate (i) its decay constant (ii) time t in which 1000 atoms are active in the sample.

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T1/2 = 3 S, N0 = 8000
(i) We know that

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