Find total angular momentum - If an atom has a state of s= 3/2 and l=2 and zero magnetic momentum what is the total angular momentum

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?