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I am currently studying the textbook Infrared and Raman Spectroscopy, 2nd edition, by Peter J. Larkin. Section 1.1 Dispersive Systems of chapter 3 says the following:A monochromator consists of an...
Asked on 09/26/2021
3 answerIs there a certain ratio between cooper pairs and normal electrons above which the sample can be said to be in a superconducting state? According to the Ginzburg-Landau theory the...
Asked on 09/26/2021
0 answerI am used to using the formula $ R_H (frac{1}{n^2_{final}}-frac{1}{n^2_{initial}}) $ to calculate the transition wavenumbers when an electron in a Hydrogen atom emits a photon. Can you...
Asked on 09/26/2021
1 answerI'm writing personnal notes on statistical mechanics and I'm tempted to write something that may turn out to be false. So I need a confirmation/infirmation and opinions on the...
Asked on 09/26/2021
1 answerI know this is kind of a philosophical question in the risk to be opinion-based, but I would like to know what the people that know a lot more than...
Asked on 09/26/2021
2 answerWe see that our calculations always gives a loss of Kinetic energy in inelastic collisions while the net momentum of the system remains the same. Where does the lost energy...
Asked on 09/26/2021
4 answerGiven a current density distribution $mathbf J(mathbf x)$ inside a closed bounded region $Omega$, the magnetic field at any point $mathbf y$ outside of $Omega$ can be expressed as$$...
Asked on 09/26/2021
2 answerI'm a newbie in physics. Sorry, if the following questions are dumb. I began reading "Mechanics" by Landau and Lifshitz recently and hit a few roadblocks right away.Proving that a...
Asked on 09/26/2021
3 answerconsider a Hamiltonian, after mean-field approximation, can be written as$$hat{H}=sum_{p}(epsilon_{p}+gn_{0})a_{p}^{dagger}a_{p}+frac{1}{2}gn_{0}(a_{k+p}a_{k-p}+hat{a}^{dagger}_{k+p}hat{a}^{dagger}_{k-p})$$where $g$ is the coupling strength between particles and $n_{0}$ is the particle density. Denote ...
Asked on 09/26/2021
0 answerThis question is a sequel of Some basic concepts in quantum field theory part 1 In Peskin's book, the part How Not to Quantize the Dirac Field, the writer...
Asked on 09/25/2021
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