35) State which method of heat transfer: (a) works when particles circulate in a path k3 (b) travels at the speed of light 36. Determine the binding energy for agu with a nuclear mass of 234.9934 u. 37. Carbon-14 has a half-life of 5430 a. Every gram of living plant or animal tissue absorbs enough radioactive C-14 to provide an activity of 0.23 Bq. Once the plant or animal dies, no more C—14 is taken in. If ashes from a fire(equivalent to 1.0 g of tissue) have an activity of 0.15 Bq, how old are they? Assume that all of the radiation comes from the remaining C-14. VI 38. Another possible fission reaction involving uranium-235 would proceed as follows: 236 1 136 90 1 uU+on-> 5‘,Xe~~w8r+110n+Energy Determine the mass loss and the amount of energy released in this reaction. 39. The function of the control rods in a nuclear reactor is to: (a) increase fission by slowing down the neutrons. {S (b) decrease the neutrons' energy without absorbing them. (c) increase the neutrons' ability to cause fission. (d) decrease fission by absorbing neutrons. 40. When uranium undergoes fission, most of the energy released comes from the: (a) kinetic energy of the bombarding neutrons. lrks (b) chemical potential energy stored in the uranium atoms. (c) radioactivity of the uranium nuclei. (d) conversion of matter into energy.

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