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Every reference I have seen says that the total angular momentum of helium ground state of is zero. My question is since the the Hamiltonian $H$ commutes with...
Asked on 12/11/2020 by amilton moreira
0 answerWhen writing Conservation of Energy equations, if you want to add a gravity component, you write, $mgh$. Where $m$ is mass, $g$ is gravitational constant, and ...
Asked on 12/11/2020
2 answerI am confused about the above question. I know that when you move a magnet in and out of a close loop of wire, you induce a EMF in the...
Asked on 12/11/2020
6 answerIf we take a (lets imagine cylindrical) resistor in DC (steady state), we have that the electric field follows Ohm’s law: $mathbf J_f=sigma mathbf E$. where $mathbf...
Asked on 12/11/2020 by Daniel Rodriguez
4 answerGiven a Lagrangian:$$L = frac{1}{2}(partial_uphi)^2 + g (partial_uphi)^4.$$ Does anyone have idea how to write down the 1-loop correction? The derivative coupling is the part that confuses...
Asked on 12/11/2020 by SnowS
1 answerIt's written multiple times in my textbook thatSome molecules at the surface of the liquid have kinetic energy more than those in the bottom, so they can escape from the...
Asked on 12/11/2020 by Manar
2 answerWhat causes the geometrical magnetoresistance effect? Sure, it is some kind of geometry but how/why? What is happening on the physical level that the resistance increases (or...
Asked on 12/11/2020
0 answerFirst I would like to remind Lorentz transformation of length and time as a matrix:$$ begin{pmatrix}ct'x'y'z'end{pmatrix} = begin{pmatrix}gamma & - frac{v}{c}...
Asked on 12/11/2020 by Jarogniew Borkowski
1 answerUntil not long ago, I was working in the drilling and infrastructure business. Some people I was working with used metal rods as a "quick and dirty" method of detecting...
Asked on 12/11/2020 by Gimelist
4 answerIs there any shorthand using the Einstein notation to write a simple sum? $X = X_1 + X_2 + X_3 ....$ Can I write: $X = X_i$ ?...
Asked on 12/11/2020 by l3utterfly
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