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How would one notate the operation leading to Eqn(1)? The flux of a substance at a point $P$ is represented by the vector $f_i$, and its vector components...
Asked on 05/26/2021
0 answerThe chemical potential is defined as:$$mu = -Tfrac{ partial{S(N,V,E)} }{ partial{N} }$$It seems to me that this is completely independent of where I put the...
Asked on 05/26/2021
1 answerLike my topic, how does the fine structure constant vary with energy?I looked it up and found:$$alpha_{eff}(q^2) = frac{alpha}{1-frac{alpha}{3pi}ln(frac{-q^2}{Am_e^2})},$$where $alpha^{-1} approx 137$, $A=exp(5/3)$, and...
Asked on 05/26/2021 by LY3000
1 answerThere's a well-known result about time reversal symmetry in crystals that's important when studying the physics of topological insulators, but I am having trouble proving it. I'll start with notation....
Asked on 05/26/2021 by Jamin
1 answerThere are many questions on this site about whether you can really fall into a black hole - some seem to say clearly yes, some say clearly no....
Asked on 05/26/2021
0 answerIn General Relativity, the following condition hold: $nabla_rho g_{munu}=0$, where $g_{munu}$ is the metric of spacetime which has to do with measuring distances and angles and $nabla$ is the covariant...
Asked on 05/26/2021
5 answerI am in Section 2.4 of Sakurai's Modern QM, 3rd Ed. We have just deduced the time independent Schrodinger equation for energy eigenstates $u_k(vec x)$ having eigenvalue ...
Asked on 05/25/2021
1 answerI understand that magnetically dependent equipment like a guitar pickup or speaker are affected by magnetic hysteresis. Here is an article discussing the effect on speakers for...
Asked on 05/25/2021
2 answerThis is a mathemetical question with perhaps a physical interpretation. I would like to solve the equation:$$ vec{nabla} times vec{A} = frac{1}{r^2} hat{r} tag{1}$$ using spherical...
Asked on 05/25/2021
5 answerI am given the speeds of eight objects, and I have to find the average speed and the RMS speed of these objects.I tried taking the actual average of...
Asked on 05/25/2021
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