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Physics : Recent Questions and Answers (Page 313)

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

Why can't $Sigma$ baryons decay strongly?

First of all, I must say this is a homework question. The complete question includes particles like $p$, $e^-$, $Lambda$ and $Omega$. It's pretty easy to...

Asked on 05/24/2021 by MiguelFuego

0 answer

Why do we need instantaneous speed?

I am new to this topic and was just wondering about the use of instantaneous speed. I mean, we use to calculate the speed of car let us say at...

Asked on 05/24/2021

8 answer

Will temperature, pressure and volume effect the value of universal gas constant in any way?

Effect of variables on constants:Will temperature, pressure and volume effect the value of universal gas constant in any way?...

Asked on 05/24/2021 by Huzefa Memon

2 answer

Are these two expressions for $mathrm{d}E/mathrm{d}t$ compatible?

This is purely recreational, but I'm eager to know the answer.I was playing around with Hamiltonian systems whose Hamiltonian is not equal to their mechanical energy $E$. If...

Asked on 05/24/2021 by Pablo T.

2 answer

Possible to calculate "Goethe spectrum" from normal spectrum

Is it possible for a given spectrum to calculate an artificial Goethe spectrum (sometimes also refereed to as edge spectrum or shadow spectrum)? Hereby a Goethe spectrum would describe the...

Asked on 05/24/2021

0 answer

How would the momentum of photons affect the stability of a Dyson sphere?

So a body surrounded by a shell experiences zero gravitational force, but how would the momentum of the photons affect a shell around a star? It seems like more force...

Asked on 05/24/2021 by andrius3000

0 answer

What is natural width in particle physics?

What is the meaning of the term "natural width" in particle physics? From http://nordberg.web.cern.ch/PAPERS/JINST08.pdf, page 2:... there is a range of production and decay mechanisms, depending on...

Asked on 05/24/2021

2 answer

Gaussian integral with respect to Grassmann variables

Let $A$ be an antisymmetric matrix of even dimension $n$ and $theta$ be a column vector consisting of $n$ Grassmann variables $theta_i$. Then the solution...

Asked on 05/24/2021 by 88888888

1 answer

If $|psirangle$ is a free fermionic state, why does its reduced density matrix $text{Tr}_C(|psirangle langle psi|)$ also obey Wick's theorem?

I have recently been trying to understand this paper. So far I understand why, given a free fermionic state $|psirangle$, it is fully characterised by its...

Asked on 05/24/2021

1 answer

Increase in temperature when a stretched wire suddenly snaps

When a wire is stretched under a force F so as to obtain an increase in length Δl the work done by the external force on the wire is(FΔl)Now the...

Asked on 05/24/2021

1 answer

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