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Physics : Recent Questions and Answers (Page 164)

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

How could an up quark turn into a down quark through practical means?

How could an up quark turn into a down quark through practical means? When I say practical means I mean not waiting for some natural occurrence like in a star...

Asked on 07/24/2021 by Emmet H

1 answer

What is the justification for the theoretical value of the adiabatic index of $rm CO_2$ of 1.30 at room temperature?

I'm currently investigating an experiment to determine the adiabatic index of helium, nitrogen and carbon dioxide at room temperature and am attempting to come up with / justify theoretical values...

Asked on 07/24/2021 by bakingbad

0 answer

Classical string propagation on compact manifold

Is there a consistent classical description of closed string propagation on nontrivial manifolds?For example higher genus smooth ones.Thanks for the answer(s)...

Asked on 07/24/2021

0 answer

Nucleon resonance

I tried to fit low baryon resonances to N(1440) in an SU(3) octet. So I started with $$frac{N + Xi}{2} = frac{3 Lambda + Sigma}{4}$$ What should the...

Asked on 07/24/2021 by Klaudia Łapa

1 answer

How to calculate relative velocity in curved spacetime?

Is there a nice geometric way to calculate relative velocity in curved space time? I'm looking from something similar to how the separation vector $n$ between $2$ neighboring...

Asked on 07/24/2021

1 answer

Are there black body-like thermal emissions of gravitational waves?

According to the answer to this previous question:Yes, all of the fields in quantum electrodynamics are excited in blackbody radiation, not just the electromagnetic field.But, (as I understand) there...

Asked on 07/24/2021 by taciteloquence

2 answer

Biot-Savart magnetic field at point $P$ semi-infinite wire

I have an infinite wire and I would like to know the magnetic field at a point $P$. $$vec{dB} = frac{u_0I}{4pi R^2} cdot vec{dl} times hat{r}$$ for a...

Asked on 07/24/2021 by RedDiamond

0 answer

Longitudinal modes in a Laser cavity

Why does "lasing" occour with the longitudinal modes of the cavity, that is, why does the longitudinal modes govern the spectral properties of a laser?...

Asked on 07/24/2021

1 answer

Why doesn't the double-slit experiment violate the uncertainty principle?

In the double-slit experiment, when an electron reaches the detector after passing through the holes, it has a certain momentum which we can measure with arbitrary accuracy. From this data,...

Asked on 07/24/2021 by Abhinav P B

6 answer

Extrinsic Semiconductor (N-type)

I'm having trouble grasping the concept of extrinsic/doped semiconductors. For example, suppose that the semiconductor is n-typed with a certain density of donors. At room temperature, about 300 K, I...

Asked on 07/24/2021 by CoderOgden

3 answer

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