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The propagation of light in optical fibers is governed by the equation $ifrac{partial A}{partial z} = frac{beta_2}{2}frac{partial^2A}{partial T^2} - gamma|A|^2A$ where $A(z,T)$ represents the amplitude of the field...
Asked on 08/31/2021
3 answerThe FRW metric can be written in conformal coordinates to give:$$ds^2=a^2(eta)(-deta^2+dmathbf{Sigma^2}),$$where $eta$ is the conformal time and $mathbf{Sigma}$ ranges over 3-dimensional space of uniform curvature....
Asked on 08/31/2021
2 answerI'm aware of the common misunderstanding about action and reaction canceling each other; they don't because they don't act on the same object. This is about a more subtle...
Asked on 08/31/2021 by Han-Kwang Nienhuys
2 answerThis is a thought experiment where I have made a "C" shaped hole inside diamond. The refractive index $(mu)$ of diamond is 2.45....
Asked on 08/31/2021
4 answerHere, the natural length of the string is $l_o$, and pulling the string up by $x$ increases its...
Asked on 08/31/2021
1 answerCoercivity of 99.8% pure iron is 1 oe but that of 99.95% pure iron is 0.05 oe.Why such difference while both have same retentivity? Edit: I mean to say if...
Asked on 08/31/2021 by sk9298
1 answerConsider the orbital angular momentum in QM, labeled by $L$ ($mathbf{L}=mathbf{r}timesmathbf{p}$). In spherical coordinate, the operator can be expressed as:begin{equation*}left{begin{aligned} L_x&=frac{hbar}{mathrm{i}}left(-sinphifrac{partial}{partial theta}-cosphicotthetafrac{partial}{partial phi}right)...
Asked on 08/31/2021 by Photon-gjq
2 answerI am working on deriving the electromagnetic stress energy tensor using the electromagnetic tensor in the $(-, +, +, +)$ sign convention. However, I have hit a snag and...
Asked on 08/31/2021
2 answerFor the purpose of this question, I'm making the assumption that atoms are fixed in space, and as such possess no vibrational degrees of freedom. A crystalline solid is a...
Asked on 08/31/2021 by W. Ryan
1 answerCan anyone figure out what is wrong with this perpetual motion machine? What part of it violates physics? I found it on a website a while ago, and I couldn't...
Asked on 08/31/2021 by F16Falcon
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