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PHYSICS- Examination 11-Continued Student's Name 22. Student Number A chain reaction is most likely to build up explosively (A) in whichever sphere of uranium has fewer than one neutron per fission available to trigger more fission (B) in two 2-g spheres of U-235 (C) in one 4-g sphere of U-235. (D) A chain reaction is as likely to occur in two 2-g spheres of U-235 as in one 4-g sphere. 23. An advantage of a nuclear fission reactor over a coal-burning furnace is (A) the waste products produced by nuclear reactors are easy to dispose of (B) nuclear reactors do not produce any waste products (C) nuclear reactors produce more energy with less fuel (D) nuclear reactors do not have to heat water to produce energy. Iron (A) releases energy when it decays into an atom with a lower atomic number (B) releases energy when it fuses into an atom with a higher atomic number (C) can release energy cither by decaying into an atom with a lower atomic number 24 or by fusing into an atom with a higher atomic number (D) does not release energy in any nuclear reaction. 25. Fusion is not used today to generate electricity because (A) scientists have not yet been able to generate a sustained fusion reaction (B) fusion reactions produce dangerous amounts of radioactive waste (C) the hydrogen used to power nuclear reactions is not plentiful in nature (D) fusion reactions become "supercritical" more easily than do fission reactions. Answer the following questions in the space provided. If you wish, you may draw and label diagrams to aid in giving your answers. Where indicated, you must show your calculations t
Explanation / Answer
Answer 22 (A) it worng because we need more neutron to trigger more fission or reaction
(B) :It is correct because 4G sphere is more critical then 2 g sphere
C) It is wrong because 2g sphere is more suitable then 4g sphere , Also more uranium has more possibility for the reaction takes place with neutron.
Answer 23 is C
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