The average kinetic energy of a thermal neutron is A)less than 0.1 eV B)about 1 eV C)about 43 eV D)about 27 keV E)about 1.6 MeV
A thermal neutron A)produces electrons by thermionic emission. B)produces protons by thermionic emission. C)ionizes atoms by an increase in thermal energy. D)creates an electron-positron pair by an increase in thermal energy. E)gains kinetic energy as often as it loses it at room temperature.
A cubical tray,one meter along the edge,contains 10,000 small hard spheres,each 0.0010 m in radius.Assume that no sphere is in front of another.If you shoot 108 small bullets (very small compared with the spheres)randomly into the broad face of the tray,the number of bullets that you can expect to be scattered by collisions with these spheres is A)104 B)106 C)107 D) 106 E)108
The cross section of a nuclear reaction is A)directly proportional to both the flux and the energy of the incident particle. B)independent of the incident particle but highly dependent on the target nuclei. C)dependent on the particular reaction being considered and the energy of the incident particle. D)influenced by the Coulomb force but is independent of the type of target nuclei and reaction. E)applicable only to neutron-induced reactions.