Question

9) When aluminum-27 is bombarded with a neutron, a gamma ray is emitted. What radioactive isotope is produced? silicon-27 silicon-28 aluminum-28 magnesium-27 magnesium-28 10) Iodine-123, which is used for diagnostic imaging in the thyroid, has a half-life of 13 h. If 50.0 mg of I-123 were prepared at 8:00 A.M. on Monday, how many mg remain at 10:00 A.M. on the following day? 50.0 mg 25.0 mg 12.5 mg 6.25 mg 3.13 mg 11) Krypton-79 has a half-life of 35 h. How many half-lives have passed after 105 h? 1 half-life 2 half-lives 3 half-lives 4 half-lives

Answer 1

28 Al A tn Y 6 13 13 (goma zrodichon) 23 130 h © Answer: Al 2129 half lite (+2) = 13.06 time (t) = 2h No.& half lite} = 20 = 2.0 500mg 13h 25mg 13b, 12.5 Lesh Amount remains = 12.5 mg nood halo lites - Total time each half lite time W = 3 half liths Scanned with CamScanner