## 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 $500 \mathrm{~Bq}$ ?

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