1) What is the half life of this substance? a) 25 days b) 50 days c) 100 days d) 12 days 2) What is the half life of this substance? a) 2 days b) 4 days c) 8 days d) 10 days 3) Half life? a) 2 minutes b) 4 minutes c) 6 minutes d) 10 minutes 4) What percentage of the substance will be left after 4 minutes? a) 50% b) 25% c) 10% d) 75% 5) What fraction will be left after 24 days a) 1/2 b) 1/4 c) 1/8 d) 1/16 6) What fraction is remaining after 4 minutes a) 1/2 b) 1/4 c) 1/8 d) 1/16 7) After 30 years, what would the count rate be? a) 100 b) 200 c) 300 d) 400 8) Which one has the longer half life? a) iodine 131 b) iodine 135

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