high energy photon scattering

I am trying to do a problem considering the photoelectric effect with Hydrogen. I need to calculate the differential cross section for scattering taking into consideration a very high energy incident photon and high energy final electron. I do not know what kind of scattering this falls under. Rayleigh scattering is only for low energy photons so I can not use that. I am wondering if I can use Thompson scattering? If anyone knows what approximations I can use to help me solve this, please respond ASAP. Also, I am allowed to use plane wave solutions for the final electron state. Does anyone know what exactly this means in terms of solving this problem??? Please help if you can.

Perturbation theory

When an atom is placed in a uniform external electric field, the energy levels are shifted - a phenomenon known as the stark effect. In this problem we analyze the stark effect for the n=1 and n=2 states of hydrogen. See attached. Must be able to read microsoft word equation editor.

angular spread of laser

Calculate the angular spread of a laser beam due to diffraction if the beam emerges through a 2.90mm diameter mirror. Assume that lambda = 686nm.

quantium model

1) For two distinguishable, non-interacting particles in a box, Quantum Mechanics says the energy must be ... (see attachment for remainder of problem)

Blackbody Radition in Flatland

Blackbody Radition in Flatland a) Carry out the derivation of u(v,t), the energy per unit area per unit frequency in the electromagnetic field, for the 2-dimentional case, i.e. inside a square cavity of side L held at temperature T. Find the total energy in the square and show that it's of the form: U(T) = (L^2)a(T^n) and determine n and a in mks units. (v is frequency) *note: in Stefan-Boltzmann expression U(T)=aT^4 where a = 705662 x 10^(-16) J/m^(3)*K^4 b) Carry out the derivation of the factor f that allows the total radiation per second per unit length of the edge of the square to be written: E(f) = fcu(T) c) Determine the frequency v,max where u(vT) is a max when T = 30... click for more