If the number of fissions are 2.375 X 1024, what is the mass of uranium 235 isotope used? a) 789.23 g b) 879.32 g c) 926.65 g d) 980.74 g
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If the number of fissions are 2.375 X 1024, what is the mass of uranium 235 isotope used?
a) 789.23 g
b) 879.32 g
c) 926.65 g
d) 980.74 g
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Solved in 2 steps
- Select the product nucleus resulting from the alpha particle decay of: 237 Np 93 a. 233 Pa 91 b. 237 Pa 91 c. 233 Np 93 d. 237 Pu 94Madame Curie filled glass vials with pure radon, produced by her radium, for use in hospitals. Radon has a short half-life of 3.8 days. Suppose that she put 1 MBq of radon in a vial. i) Sketch a graph of the activity of the radon over the next week or two. Label the axes with appropriate numbers and units. Mark on the graph the half-life and the characteristic time. ii) Radon decays through a chain of four very short-lived radionuclides (halflives of 20 minutes and less) before reaching a relatively stable isotope of lead. Approximately what activity will the vial have two or three hours after filling, and about two weeks after filling?A sample of plutonium-239 has a mass of 24.0 mg. If after 72300 years 6.00mg are left, what is the half life of this isotope?
- One possible fission reaction is n +235U→ Sr+X+12'n, where X is unknown. What is the unknown 92 nucleus? Give answer in the proper nomenclature. 88The half-life of radon-222 is about 3.823 days. (a) Determine the decay constant for radon-222. 2.1x10-65-¹ ✓ (b) What percentage of a sample remains undecayed after two weeks (1.21 x 106 s)? %Which of the following statements about nuclear fission is true? a. No new elements can be produced in a fission reaction. b. Energy released in fission reactions is generally less than that from fusion reactions. c. In a fission reaction, two light nuclei are combined into a heavier one. d. Fission reactions can be explained on the basis of the conservation of mass-energy.
- 9. A rock that contains 1.2x10-12 mol of 232Th (t1/2 = 1.4x1010 yr) has 4.2x105 fission tracks, each track representing the fission of one atom of 232Th. How old is the rock?Bq. Determine the half-life (in s) of a radioactive sample that contains 1.50 x 1015 atoms and has an activity of 6.60 x 101Question 9 Why is a moderator required in a thermal nuclear reactor core? A To prevent overheating of the fuel rods. B To absorb surplus neutrons. C To shield the surrounding area from dangerous gamma radiation. To reduce the kinetic energy of thermal neutrons.