A beam of 3-MeV photons with intensity 108 cm−2 s −1 irradiates a small sample of water. (a) How many photon-water interactions occur in one second in one cm3 of the water? (b) How many positrons are produced per second in one cm3 of the water? 13. Shultis, J. Kenneth; Faw, Richard E.. Fundamentals of Nuclear Science and Engineering (p. 219). CRC Press. Kindle Edition.

An alpha particle with kinetic energy 12.5 mev makes a collision with lead nucleus, but it is not "aimed" at the center of the lead nucleus, and has an initial nonzero angular momentum (with respect to the stationary lead nucleus) of magnitude l = p0 b, where p0 is the magnitude of the initial momentum of the alpha particle and b=1.40×10−12 m. (assume that the lead nucleus remains stationary and that it may be treated as a point charge. the atomic number of lead is 82. the alpha particle is a helium nucleus, with atomic number 2.) what is the distance of closest approach?