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The half-life of oxygen-15 is $124 \mathrm{~s}$. If a sample of oxygen-15 has an activity of $4000 \mathrm{~Bq}$, how many minutes will elapse before it reaches an ...

Question

The half-life of oxygen-15 is $124 \mathrm{~s}$. If a sample of oxygen-15 has an activity of $4000 \mathrm{~Bq}$, how many minutes will elapse before it reaches an activity of $500 \mathrm{~Bq}$ ?

The half-life of oxygen-15 is $124 \mathrm{~s}$. If a sample of oxygen-15 has an activity of $4000 \mathrm{~Bq}$, how many minutes will elapse before it reaches an activity of $500 \mathrm{~Bq}$ ?



Answers

(I) A radioactive material produces 1120 decays per minute at one time, and 3.6 h later produces 140 decays per minute. What is its half-life?


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