Hello, First of all, i know I should use the template for this, and I apologize for that, but the thing is I don't even know how to begin to solve the next problem, and it's very important for me and for my tomorrow's afternoon exam. It's quite qualitative, and I'm sure most of you will know the answer very quickly. Here it goes: Hydrogen in its fundamental state is excited with lineal polarized light, and the return to lower states is observed. When the hydrogen is put in a magnetic field with Z direction, there are not new frequencies in the spectrum. However, the emission is unfolded in two lines when the direction of polarization is turned Pi/2. Justify this fact and say what is the direction of polarization in those two cases. Thank you so much, I really appreciate your help.