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Physics : Recent Questions and Answers (Page 593)

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

Law of Amontons for tire pressure

I am a bit confused what tire pressure to use when doing calculations using ideal gas laws such as Amonton's law (pressure proportional to temperature at constant volume). As far...

Asked on 02/04/2021

1 answer

Einstein summation convention in deriving Coulomb's law

Schwartz's QFT equation (3.43) reads $$ mathcal{L} = - frac{1}{4} (partial_mu A_nu - partial_nu A_mu)^2 - A_mu J_mu. tag{3.43}$$ Does the contraction of $mu$ on the last term...

Asked on 02/04/2021 by Physics Enthusiast

1 answer

Are polarization-entangled photons correlated spatially?

Are polarization-entangled photons correlated spatially? That is, if I took a pair of entangled photons and looked at their spatial modes with two cameras (one for each photon), would I...

Asked on 02/04/2021

0 answer

Proof of a vector calculus identity

In https://arxiv.org/abs/hep-ph/0010057 the following vector calculus equality is claimed without proof although in note [4] the cryptic comment is made that "The relation is essentially the momentum...

Asked on 02/04/2021 by hyportnex

1 answer

Modifying Feynman-Wheeler absorber theory to work with arbitrary potentials?

I'm trying to consider relativistic multi-body dynamics in special relativity. In classical mechanics, it's easy to write a simple $n$-body system with arbitrary potential $V$: begin{equation}m...

Asked on 02/04/2021

1 answer

Why is a kalimba note anharmonic?

I play a kalimba, and have also recently written a toy program that helps me tune it using a "naively applied FFT" without any...

Asked on 02/04/2021 by Reinderien

1 answer

Body falling off a smooth hemisphere - simple but I'm missing something. What is it?

So here's the question that I'm stuck on.A particle slides from the top of a smooth hemispherical surface of radius $R$ which is fixed on a horizontal surface. If...

Asked on 02/04/2021 by Alfa Boing

1 answer

Are the units for the magnetic moment correct for this paper?

Can the units of $$frac{e,c}{2pi,f},$$ where $c$ is the speed of light, $e$ is the elementary charge and $f$ is the frequency, be correct for the...

Asked on 02/04/2021 by milk breath

1 answer

Why energy restrictions in the infinite square well are general?

I'm looking at the infinite square well case for solving the Schrodinger equation in quantum mechanics. I see that when solving the time-independent Schrodinger equation, we find that the energies:...

Asked on 02/04/2021

3 answer

Derivation of the Berry Curvature and Bloch Magentic Moment in Graphene

(I found a workable solution, skip to the "Solution" part to see it) I am attempting to derive equations 2 and 6 from Xiao et al. paper "Valley contrasting physics...

Asked on 02/04/2021 by John Tiessen

1 answer

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