The activity of a radioactive substance decreases from to in days

PHYSICS · Subjective · A Level · Physics · Nuclear physics · Nuclear physics

Problem

The activity of a radioactive substance decreases from 8000 Bq8000\,\text{Bq} to 1000 Bq1000\,\text{Bq} in 99 days. What are the half-life and mean life of the radioactive substance?

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