15. What would the daughter-to-parent ratio be for this isotope pair 32 days after the iodine-131 was released into the environment? 3 to 1 15 to 1 a. c. 7 to 1 31 to 1 b. d. 16. The official account of the Chernobyl accident estimates the total amount of iodine-131 released to be between 80 and 400 g. If measurements taken 40 days after the accident indicated that a total of 10 g of iodine-131 remained, what mass of this radioisotope was originally released? 80 g 160 g a. c. 120 g 320 g b. d. Use the following decay curve for strontium-90 to answer the next two questions. 17. The half-life of strontium-90 is approximately: 15 years 50 years a. c. 30 60 years b. d. 18. What mass of strontium-90 will exist in 150 years if you began with 100.0 g today? 25.0 g 6.25 g a. c. 12.5 g 3.12 g b. d. 19. Which of the following are correct statements about nuclear fission? I. Two small nuclei fuse to form a single larger nucleus. II. Mass is converted into energy. III. Nuclear power plants employ the process to generate energy. IV. The process occurs in the Sun and in hydrogen bombs. I., II., and III. only II. and III. only a. c. I. and IV. only I., II., III., and IV. b. d. Consider the following nuclear equation: He + ? He + 2 H  20. Which of the following represents the missing particle? H H a. c. He He b. d. 21. The majority of the energy released from a hydrogen bomb results from:
15. What would the daughter-to-parent ratio be for this isotope pair 32 days after the iodine-131 was released into the environment? a. 3 to 1 c. 15 to 1 b. 7 to 1 d. 31 to 1 16. The official account of the Chernobyl accident estimates the total amount of iodine-131 released to be between 80 and 400 g. If measurements taken 40 days after the accident indicated that a total of 10 g of iodine-131 remained, what mass of this radioisotope was originally released? a. 80 g c. 160 g b. 120 g d. 320 g Use the following decay curve for strontium-90 to answer the next two questions. 17. The half-life of strontium-90 is approximately: a. 15 years c. 50 years b. 30 d. 60 years 18. What mass of strontium-90 will exist in 150 years if you began with 100.0 g today? a. 25.0 g c. 6.25 g b. 12.5 g d. 3.12 g 19. Which of the following are correct statements about nuclear fission? I. Two small nuclei fuse to form a single larger nucleus. II. Mass is converted into energy. III. Nuclear power plants employ the process to generate energy. IV. The process occurs in the Sun and in hydrogen bombs. a. I., II., and III. only c. II. and III. only b. I. and IV. only d. I., II., III., and IV. Consider the following nuclear equation: He + ?  He + 2 H 20. Which of the following represents the missing particle? a. H c. H b. He d. He 21. The majority of the energy released from a hydrogen bomb results from:
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