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Suppose a radioactive nucleus has a half-life of 2 min. and suppose the counting rate at t = 0 is 3000 counts/s.

  1. What is the counting rate after 2 min?
  2. After 6 min?
  3. After 10 min?
  4. After 20 min?
  5. What is the mean life of this nucleus?
  6. Suppose that the Geiger counter detects 10% of all the radioactive decays. What is the total
  7. number of radioactive nuclei at time t = 0?
  8. What is the total number at t = 2 min?
  9. How many nuclei decay in the first 2 minutes?
  10. What is the initial decay rate?
  11. Why is the answer in h. not equal to the answer in i. times 120 sec?

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