One in 4 600 water molecules contains a deuterium atom. If all the deuterium could be extracted from 1 m3 of water and then reacted, how much energy could be obtained? (Each D-D fusion liberates 3.65 MeV of energy, 1 MeV = 1.6 1013 J, water = 103 kg/m3, one mole of water has a mass of 18 g, and NA = 6.02 1023)
a. 4.2E+12 J
b. 1.3E+25 J
c. 3.5E+11 J
d. 2.1E+12 J
e. 6.9E+14 J
[Ques. 2] In a fusion reactor, the high temperature of the order of 108 K is required in order that what condition is met?
a. melt down the hydrogen fuel
b. strip the hydrogen atoms of their electrons
c. break the protons into their elementary particle sub-parts
d. overcome Coulomb repelling forces between protons
[Ques. 3] Calculate the energy released in the following fusion reaction where reactants are 6Li and a neutron; products are 4He and 3H. (atomic masses: 6Li, 6.015 12; neutron, 1.008 67; 4He, 4.002 60; 3H, 3.016 031; also 1 u = 931.5 MeV/c2)
a. 2.95 MeV
b. 4.81 MeV
c. 8.63 MeV
d. 17.2 MeV
[Ques. 4] In a nuclear fusion reactor, the Lawson criterion prescribes the necessary conditions, as related to density and confinement time of the plasma fuel, in order that the process produces a net power output. If the fuel density were doubled, by what factor would the required confinement time change?
a. 0.25
b. 0.50
c. 1.4
d. 2.0
[Ques. 5] When comparing product nuclei to reactant nuclei in an exothermal nuclear fusion process, which has the greater binding energy per nucleon?
a. greater in product nuclei
b. greater in reactant nuclei
c. equal in both product and reactant nuclei
d. None of the above choices are valid.
[Ques. 6] If a self-sustained controlled fusion reaction is to operate, a condition which must be met is that the fuel material be subjected to which of the following condition(s)?
a. confined for sufficient time period
b. have sufficiently high density
c. be at sufficiently high temperature
d. All of the above choices are valid.
[Ques. 7] The advantage of a fusion reactor when compared to a fission reactor is which of the following?
a. The fuel is cheaper.
b. There is less radioactive waste material.
c. Both choices above are valid.
d. None of the above choices are valid.
[Ques. 8] A plasma can be contained in a magnetic bottle because it has which of the following properties?
a. high temperature
b. liquid in form
c. made of charged particles
d. made of light elements
[Ques. 9] When uranium fissions into two medium-mass nuclei, the product nuclei tend to have an excess of neutrons when compared to stable nuclei. What type of radioactive decay would one expect from these product nuclei?
a. meson decay
b. negative beta decay
c. positive beta decay
d. proton decay
[Ques. 10] Calculate the energy (in kWh) given off if five kg of plutonium-239 undergoes complete fission. The energy released per fission is 200 MeV. (1 MeV = 1.6 1013 J)
a. 1.1E+11 kWh
b. 6.4E+12 kWh
c. 1.6E+16 kWh
d. 1.1E+8 kWh
e. 5.4E+9 kWh
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