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Physics : Recent Questions and Answers (Page 73)

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

Specific note that is not clear for me in and the derivation of maxwell equation $oint vec{B} cdot d vec{r}=mu_{0} I_{e n c}$

I know this is not the full equation but right now in this path of the course that what we learned so far. We studied that a wire along the...

Asked on 09/03/2021

2 answer

Negative temperature of the de-Sitter horizon?

I'm considering the $4D$ de-Sitter spacetime, in static coordinates (I'm using $c = 1$ and $k_{text{B}} = 1$):begin{equation}tag{1}ds^2 = (1 - frac{Lambda}{3} , r^2)...

Asked on 09/03/2021

1 answer

What is the physical explanation for Newton's laws of cooling?

In my calc 1 class we covered these laws and (rate of change proportional to difference in temperature) I would like to know why they are true, or at least...

Asked on 09/03/2021 by user233953

1 answer

Single photon interference

In any interference experiment, whether it be an unequal arm length interferometer or the classical double slit set up, we have two unequal distances from source (or slits) to screen/detector....

Asked on 09/03/2021 by Weezy

4 answer

Atom flies into deep space. Will it radiate heat and stop eventually?

If an atom flies long enough into deep space, without colliding any other matter or EM waves (purely thoughtful experiment), what does happen?Because velocity vector is unchanged, no EM waves...

Asked on 09/03/2021 by danbst

1 answer

What is the physical meaning of the energy density of an electrostatic field?

I understand the physical meaning of electrostatic energy of a system of charges (or a distribution with given density) as the energy stored in the system while working to carry...

Asked on 09/03/2021 by user6452

3 answer

Non-Vacuum Solutions for Black Hole Interiors

Everything I read about black holes—discussions using Penrose diagrams and Kruskal coordinates, etc.—seems to be based on vacuum solutions to EFE. Sometimes it’s said that all trajectories entering a BH...

Asked on 09/03/2021

0 answer

Why does work depend on the path for some forces but not for others?

I have learned that work done by conservative forces is independent of the path followed between initial and final position. But that's not the case for non-conservative forces, they depend...

Asked on 09/03/2021 by user282856

4 answer

How would the existence of a magnetic monopole require the removal of world line from spacetime?

I was studying Lienard-Wiechert Potentials from Griffiths, where he wrote that electric charges cannot travel at the speed of light. Which led me to a rabbit hole of charges both...

Asked on 09/03/2021 by Soban Bakhtiyar

0 answer

Describing the position of particles in QFT

Background As someone who has just finished my first year of undergrad, I don't really have any experience with QFT but have some experience with quantum mechanics and the math...

Asked on 09/03/2021

1 answer

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