1) Sodium-24 has a half life of 15 hours. If a sample of sodium-24 has an original activity of 500Bq, what will its activity be after 60 hours? a) 62.5 b) 250 c) 31.25 d) 75 e) 125 2) The half-life of radon-222 is 3.8 days. What was the original activity if it has an activity of 10 Bq after 7.6 days? a) 10Bq b) 5Bq c) 20Bq d) 40Bq e) 80Bq 3) The half-life of protactinium-234 is 6.75 hours. What percentage of a sample will remain after 27 hours? a) 50% b) 25% c) 12.5% d) 6.25% e) 3.125% 4) The half-life of tritium (hydrogen-3) is 12 years. If 48.0 mg of tritium is released from a nuclear power plant during the course of a mishap, what mass of the sample will remain after 49.2 years? a) 3mg b) 6mg c) 12mg d) 24mg e) 48mg

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