A radioactive isotope has an activity of 932 times 104 bq

A radioactive isotope has an activity of 9.32 × 10⁴Bq initially. After 3.55 hours the activity is 6.71×10⁴ Bq.

A.) What is the half-life of the isotope?

B.) What is the activity after an additional 3.55 hours?

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