Question

TO A so-mg sample of iodine 131 was placed in a container 32.4 days ago. If its half-life is .I days, how many milligrams of iodine-131 are now present? A) 47.3 mg B) 3.1 mg C) 3.24 mg D) 0.8 mg E) 6.2 mg 11. What nuclear process involves heavy nuclei splitting into lighter nuck A) gamma decay B) beta decay C) breeding D) fission E) fusion 12. Ame ricium-241 is a radioactive isotope used in smoke detectors. If the symbol for this isotope is Am, A) 241 protons, 241 electrons, 95 neutrons B) 95 neutrons, 241 protons, 146 electrons C) 95 protons, 95 electrons, 51 neutrons D) 146 neutrons, 95 protons, 51 electrons E) 95 protons, 95 electrons, 146 neutrons which of the following correctly describes its subatomic composition? 14. The half-life of cobalt-60 is 5.3 years. What percent of a sample of cobalt-60 will remain after 21.2 years? A) 50% B) 40% C) 12.5% D) 10% E) 6.25% 15. Which of the following is FALSE about the energy diagram shown? 100 75 50 ion

Answer 1