Physics 0625 · IGCSE · Radioactivity

Radioactivity — practice question

Oxygen-15 is employed in hospitals. A detector positioned near a sample of oxygen-15 recorded the count rate for 15 min. The background count rate is 20 counts/min. What is the half-life of this oxygen-15 sample?

  • A2.0 min
  • B2.4 min
  • C2.8 min
  • D7.5 min

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