# approximation

1. ### scattering from a dipole born approximation

So I am trying to understand and solve the problem mentioned in the title.I found a solution online: https://physics.bgu.ac.il/COURSES/QuantumMechCohen/ExercisesPool/EXERCISES/ex_9011_sol_Y09.pdf The problem is, I can't understand this step: https://ibb.co/H4pmtyz I relly can't find out how...
2. ### semiempirical binding energy--coulomb approximation

Hi, I've been stuck on this one thing in my textbook. For the coulomb approximation--as part of the semiempirical binding energy formula--it is given as: B<coul>=-a<coul>Z^2/A^(1/3) where: a<coul>=3/5*ke^2/R<0> The issue that I'm having is that the book and also online sources...
3. ### Approximation

Just wondering! I believe every consideration, every non-mathematical aspect of all of physics is approximate. Put otherwise, every discussion, all proofs, even base ideas of physics begin with assumption (some made explicit others implicit or unknown). Seems physics always begins with...
4. ### second-order approximation for Third-Order system

Dear all Please help me to understand why (a) is correct, (b) is not correct about the second-order approximation for Third-Order system. Example as follows http://i.imgur.com/LsAjpWc.jpg thank u for ur help ************ Matthew
5. ### Tight binding approximation, Brillouin zone, Fermi ,...

Hello, In few days, I have an examination, and I still have some dark zone in my head! If somebody could help me by giving me some advices/answers/way of reflexion/books to consult, it could be very great! Here is my questions: How to determine energy levels and wavefunction of the localized...