A chain reaction is most likely to build up explosively (A) in whichever sphere

Question

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. An advantage of a nuclear fission reactor over a coal-burning furnace is 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 either by decaying into an atom with a lower atomic number or by fusing into an atom with a higher atomic number (D) does not release energy in any nuclear reaction. 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 to receive full credit for a correct answer. (A) The frequency of gamma radiation is 10^22 Hz. If Planck's constant, h, is equal to 6.6 times 10^-34 J middot s, what is the energy of each gamma ray photon? Show your calculations. C = Hf c = 6.6 times 10^-34 J middot s(10^22)

Explanation / Answer

then energy of photon is given by product of Planck's constant and frequency

E = hf

h = 6.626*10-34m2kg/s

f = 1022 Hz

E = 6.626*10-34*1022 = 6.626*10-12 Joule

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