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Physics : Recent Questions and Answers (Page 62)

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

Describing the deformation of a medium as a diffeomorphism

In this paper online, the author models the deformation of a medium as a diffeomorphism $ mathbb{R}^3 rightarrow mathbb{R}^3$ as given by: $$ y^i mapsto...

Asked on 09/27/2021

1 answer

LED tubes (fluorescent replacements) refresh rate

I replaced fluorescent lights in our kitchen with LEDs. I can see an occasional flicker with the LEDs. Is the flicker caused by the way the bulb(s) was made or...

Asked on 09/26/2021 by D. Weatherspoon

1 answer

How does Bohmian mechanics explain the effect of information in the double-slit experiment?

De Broglie and David Bohm found a method (1952) that explains the double-slit experiment and its variations, which are so central to QM, in an intuitive way without appeal to...

Asked on 09/26/2021 by David Spector

1 answer

Scully’s DCQE paper 1999 - reasons for phase shift

http://Arxiv.org/abs/1103.0117 Or better Google the paper using string:arxiv:quant-ph/9903047v1 In order to “see” (detect) the interference patternwe have to take...

Asked on 09/26/2021 by Michael W.

3 answer

Is $mu$ the renormalization or factorization scale in the DGLAP equations?

The DGLAP equations read$$frac{partial f_i(x,mu^2)}{partiallnmu^2}=sum_jint^1_xfrac{dz}{z}P_{ij}(z,alpha_s(mu^2))f_jleft(frac{x}{z},mu^2right),$$where the $f_i$ are the parton distribution functions (PDFs), $P_{ij}$ are the so-called splitting kernels and $x,z$ are longitudinal momentum...

Asked on 09/26/2021

1 answer

Pressure at the opening of tube in Siphon

Consider a siphon tube... Now consider the opening of the tube at the lower end. Isn't the pressure at the mouth of the tube, at this lower end, something intermediate...

Asked on 09/26/2021

1 answer

The Purcell effect, it's influence on the lifetime and quantum yield (of fluorophores)

So I've been looking into the Purcell effect and how it interacts with fluorophores (fluorescent molecules). The Purcell arises when you have a dipole in a cavity or even just...

Asked on 09/26/2021 by Bob van de Voort

0 answer

Angle between acceleration and velocity

Problem:A particle is constrained to move in a circle with a 10-meter radius. At one instant, the particle's speed is 10 meters per second and is increasing at a rate...

Asked on 09/26/2021 by Sonia Afrin

2 answer

Example of a space group which does not contain the point group as a subgroup

In my current understanding, a space group $G_infty$ is a combination of a crystallographic point group $G_0$ and translations in the following way: $(R_1,vec{t_1})(R_2,vec{t_2}):=(R_1R_2,vec{t_1}+R_1vec{t_2})in G_infty$. Now I...

Asked on 09/26/2021

1 answer

What is an example of LOCC measurement which is not separable?

Could you give me an example of a measurement which is LOCC (Local Operations Classical Communication) but not separable? Or better, one which is separable but not LOCC? Given...

Asked on 09/26/2021

1 answer

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