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These days I am spraying the leaves of my garden, to prevent insects, mixing strongly water and soya oil. The color has become all white. Soy oil has a...
Asked on 12/17/2020
1 answerI've got a couple of doubts regarding modal dispersion (with respect to optical fibers)What's the difference between intermodal and intramodal dispersion?How does intermodal dispersion affect bandwidth of multimode fibers?How can...
Asked on 12/17/2020
0 answerI'm half way through the excellent "Student Friendly Quantum Field Theory" and I read that single vertex Feynman diagrams in QED are "not physical" because their corresponding amplitudes are zero....
Asked on 12/17/2020 by Alex Zeffertt
1 answerIn equations that have quantities with physical dimension. Example: $mathrm{Force} = (mathrm{mass})(mathrm{acceleration})$ or $F=ma$ I know that we use that (mass, force...) to help what we should use in the...
Asked on 12/17/2020 by Kaique Gomes
10 answerI've been taught that if a point-sized object is placed between two plane mirrors at an angle theta with each other, then the number of images formed is 360°/theta or...
Asked on 12/17/2020 by ghosts_in_the_code
0 answerI'm taking a course on electrodynamics and I'm confused when we start talking about potentials. The electromagnetic field seems to have 6 independent components to me. It's described by six...
Asked on 12/17/2020
2 answerI have been reading literature on fuses and came across the joule integral or $i^2t$ value many times. Often, it is referred to as energy but I am confused...
Asked on 12/17/2020 by abc 22413
1 answerOne formula for light intensity is$$I = frac{nfh}{At},,$$where:$n$ is the number of photons;$h$ is Planck's constant;$f$ is the frequency;$A$ is the incident area;...
Asked on 12/17/2020 by Jesús Portillo
1 answerI am trying to derive the Poisson equation for pressure, specifically that $$bigtriangledown^2(p + frac{1}{2}|vec{u}|^2) = bigtriangledown cdot(vec{u}times vec{w}) + varepsilon kappa^2psicdotbigtriangledownphi $$ where the vorticity field is given...
Asked on 12/17/2020 by Andrew Pearce
1 answerUntil now, I thought electromagnetic potential $A^{mu}(x)$ transform like $x^{mu}$ under the Lorentz transformation:$$A^{mu}(x)=Lambda^{mu}_{ nu}A^{nu}(x).$$But according to time reversal symmetry of governing equations, $A^{mu}(x)=(A^{0}(x),...
Asked on 12/17/2020
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