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Physics : Recent Questions and Answers (Page 195)

Find answers to your questions about Physics or help others by answering their Physics questions.

What is the thinnest metallic sheet commercially available and what is the thinnest sheet of metal producable in lab?

I was curious reading about rutherfords alpha scattering experiment in which they used the thinnest gold foil available at the time. I was wondering after a 100years how thin the...

Asked on 07/10/2021 by Akif Ismail

1 answer

Can one model fluid flow only by using the convection–diffusion equation?

Modeling fluid flow in a coil seems very complicated, especially for turbulent flow. Having Navier-Stokes equations seems to be the right way to go, but I was wondering... can one...

Asked on 07/10/2021

0 answer

Rosen coordinates

I would like to express this spacetime interval for a spacetime with a monochromatic electromagnetic wave for which I believe $|E|=frac{q}{omega}sin(u)$ expressed in Rosen coordinates: $ds^2=-2dudv+C^2left( frac{q^2}{omega^2},2frac{q^2}{omega^2},omega uright...

Asked on 07/10/2021

0 answer

Locality of the Turbulent Energy Cascade

Locality appears to be an omnipresent feature of physics, including within turbulent fluid dynamics. In 1941 Kolmogorov postulated that the turbulent energy cascade is driven by scale-local interactions, where the...

Asked on 07/10/2021 by Nik Gourianov

1 answer

Biconvex lens kept on a plane mirror

Q. A thin biconvex lens is kept on a plane mirror. When an object is kept at $20 cm$ in front of the lens, its image is formed at...

Asked on 07/10/2021

2 answer

Doubt in the derivation of Gauss's law in dielectrics

so in the 2nd page,when the dielectric...

Asked on 07/10/2021 by Hawkingo

1 answer

Relativistic action is a constant?

Say that you want to find the equations of motion of a free relativistic massive point particle by minimizing the action $$S=-mintmathrm{d}tau,sqrt{eta_{munu}frac{mathrm{d}x^mu}{mathrm{d}tau}frac{mathrm{d}x^nu}{mathrm{d}tau}}.tag{1} $$ But I'm very confused, because it...

Asked on 07/10/2021

1 answer

Is the effective Hamiltonian obtained via Feshbach-Fano partitioning closed?

I am not familiar with Feshbach-Fano partitioning so this question may be trivial. The full Hamiltonian of an open quantum system consists of system+enviroment+interaction. This can be cast into an...

Asked on 07/10/2021 by user239970

1 answer

Gauge Transformation of Lagrangians

in my lecture of theoretic mechanics my prof introduced the invariance of the lagrangian under gauge transformation. I know how to do it and why i am allowed do it...

Asked on 07/10/2021 by user123962

2 answer

Conformal transformation vs diffeomorphisms

I am reading Di Francesco's "Conformal Field Theory" and in page 95 he defines a conformal transformation as a mapping $x mapsto x'$ such that the metric is invariant...

Asked on 07/10/2021 by MBolin

3 answer

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