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Activity of a radioactive substance decr...

Activity of a radioactive substance decreases from 8000 Bq to 1000 Bq in 9 days. What is the half-life and average life of the radioactive substance?

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The correct Answer is:
A, B, C, D
`1000=(1/2)^n8000`
`:.` `n=3=number of half-lives`
These half-lives are equivalent to 9 days. Hence, one half-life is 3 days.
`t_(av)=1.44 t_(1//2)=1.44xx3=4.32days`
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