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- 5.78 Cesium-137, used in cancer treatment, has a half-life of 30 yr. (5.2, 5.4) a. Write the balanced nuclear equation for the beta decay of cesium-137. b. How many milligrams of a 16-mg sample of cesium-137 remain after 90 yr? C. How many years are required for 28 mg of cesium-137 to decay to 3.5 mg of cesium-137?Part 2: Balancing Nuclear Reactions (5.2) 238 92U. 23Th + He 90 1. Identify the reactants and products in the above reaction. 2. For each element, what do the top (superscripted) and the bottom (subscripted) numbers represent respectively? 3. How many protons and neutrons are found in the uranium isotope used above? 4. How many protons and neutrons are found in the thorium isotope used above? 5. What is the difference in, a. the number of protons between U and Th? b. the number of neutrons between U and Th? c. the mass number between U and Th? 6. How do you explain these differences with respect to the nuclear reaction above?(7) Carbon-14 dating is used in archeology to determine the age of items that were alive or were made from living materials. This works because the proportion of radioactive Carbon-14 to the other isotopes of Carbon is relatively constant in the atmo- sphere. (Volcanos constantly refresh the C-14 content.) A wooden tool from an archeological site is found to contain 22 micrograms of C-14, whereas a similar hnount of modern wood would contain 100 micrograms. How old is the tool? 58 surface weat..pdf JoanneCarbonell .pdf PDF
- 5.62 Write the balanced nuclear equation for each of the following: (5.1, 5.2) a. potassium-40 (6 decay b. sulfur-35 (8 decay) c. platinum-190 (a decay) d. Ra-210 (a decay) e. In-113m (y emission)The half-life of Radium-221 is 30 seconds. Suppose we have a 320 g sample. (7.1) Find a formula for the mass remaining after t seconds. (7.2) Use the formula to determine how much of the sample remains after 210 seconds. (7.3) After how many minutes will only 10 g remain?The table below is a summary of different modes of nuclear decay. Fill in the changes in atomic number (Z), number of neutrons (N), and mass number (A) in each case. Use “+” sign for increase, “–“ sign for decrease, and “0” for no change. Provide the symbol for each elementary particle involved in the decay process. (12 points) Decay Mode Particle Symbol Change in: Change in: Change in: Z N A Alpha decay 4/2α Beta decay 0/-1 β Positron decay 0/+1 β Electron capture 0/-1 e
- Part 1: Writing Radioactive Decay Reactions (5.2) lodine-131 (131I) isotope undergoes beta decay. 1. Write the symbol for the beta particle released by iodine-131 (show the respective superscript and subscript values). 2. In the nuclear equation for beta decay of iodine-131, does the beta particle appear on the reactant or product side of the arrow? Why?i need clear ans and solve very very fast in 20 min and thank you | DYBALA : A certain container has a 0.56 g of 90Sr. Calculate the activity of the material in units of curies? (77.3 ci)4.9. How long will it take for each of the following radioisotopes to decrease to 0.0001% of its initial activity? (a) 99MO (b) 99MTC (с) 1311 (d) 1251
- 6.7 A neutral K meson decays in flight via KO n*x. If the negative pion is produced at rest, calculate the kinetic energy of the positive pion. [Mass of K° is 498 MeV/c2; that of n is 140 MeV/c?]The list provided is the correct number of neutrons in each of the following isotopes: (B 10, Hg 199, Cu 63, C 13, Se 77) (5, 119, 34, 7, 43) TRUE OR FALSE(Q121) Technetium-99 is an unstable isotope used in various medical procedures. Given a half life of 8.01 hours, what is the activity (in Curies, Ci) of a 1.41 µg sample?