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Physics : Recent Questions and Answers (Page 175)

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

Is there something similar to Noether's theorem for discrete symmetries?

Noether's theorem states that, for every continuous symmetry of an action, there exists a conserved quantity, e.g. energy conservation for time invariance, charge conservation for $U(1)$. Is there any...

Asked on 07/19/2021

11 answer

While launching aritificial satellite,is orbital plane perpendicular or // to equatorial plane of earth?

If both system is possible, how do we launch satellites so as to make orbital plane perpendicular or // to equatorial plane of earth?...

Asked on 07/19/2021

1 answer

Zeroth law of thermodynamics confusion

I quote from Zemansky's "Heat & Thermodynamics";"Imagine two systems A and B separated from each other by an adiabatic wall but each in contact with a third system C through...

Asked on 07/19/2021 by Khalid T. Salem

2 answer

Cherenkov light rings

Let's suppose a muon emits Cherenkov light while travelling in a medium along a straight line. Let's suppose the motion is perpendicular to a wall which is instrumented with photomultipliers....

Asked on 07/19/2021

0 answer

How to compute the charge as a function of time in a simple $CL$ circuit?

I am trying to compute $q(t)$ in a series circuit consisting of a capacitor of plate charges $q_0$ and $-q_0$ and an inductor. The switch is closed at time $t=0$....

Asked on 07/19/2021

1 answer

Symmetry transformations of states and operators

Let's consider a quantum system in a state $left| psi right>$ relative to an observer using a coordinate frame $F$. We now introduce a second observer, using a...

Asked on 07/19/2021

3 answer

Dirac matrices in dimensional regularization, get correct order epsilon

Let us work in dimension $D = 4-2epsilon$. In 4-dimension, we can write $text{Tr}[A B]$, where $A$ and $B$ are string of gamma matrices, as ...

Asked on 07/19/2021

1 answer

Angular momentum conservation in pion decay?

I have seen the charged pion decay $$pi^{-}~to~ bar{nu}_{ell} +ell^{-}$$ represented with diagrams containing a $W^-$ in the $s$-channel. The $pi^-$ and $W^-$ have angular momentum $0$ and $1$...

Asked on 07/19/2021 by amc

4 answer

Phase Transition, Stability of thermodynamic Potentials

I was studying the stability of thermodynamic potentials. It is obvious that internal energy is a convex function of $(S,V) $, and in case of instable circumenstances, the system...

Asked on 07/19/2021 by George Demeteiou

0 answer

What exactly is Landau Damping?

I would like to understand what exactly happens when Landau damping takes place. I have seen the mathematics of it. But I am not sure If I truly understand what...

Asked on 07/19/2021

3 answer

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