Find the magnetic moment - An excited atom has a configuration of 1s2 2s2 2p 3d is in the state with the greatest possible total angular momentum. Find the magnetic moment of the atom in ther of Bohr magneton.

energy and momentum of photon - An electron moving at a speed of 0.60c collides head on with a positron of speed at 0.60c. Determine the energy andmomentum of each photom produced in the process.

Electron Shielding - You are a radiation scientist working for the space agency. A Mission Coordinator asks you to design shielding to prevent monoenergetic 10 MeV electrons from interacting with a cell culture that is to be flown on an upcoming space shuttle mission. The cell culture is covered with a 1 cm thick sheet of Lucite (density = 1.19 g/cm^3) - see figure below. a) What thickness of l...

Activation - A cobalt foil, 1 cm diameter x 0.1 mm thick, is irradiated in a mean thermal flux of 10^11 n/cm^2-s for a period of 7 days. If the activation cross section is 36 barns and if the density of cobalt is 8.9 g/cm^3, what is the activity (Bq) at the end of the irradiation period?