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Physics : Recent Questions and Answers (Page 601)

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

Photon pumping in Laser

Let's consider a ring laser where the laser must pass through the gain material before it is sent toward a partially reflective surface $ R=1-T $. The other mirrors are...

Asked on 02/01/2021 by kuantumbro

1 answer

What is an axial and polar vector?

Can someone please explain this type of vector to me, I can not understand it.Axial vectors have an inner orientation, i.e. the direction of the vector indicates the positive orientation....

Asked on 02/01/2021 by Daniel OnoRoc

1 answer

What happens to the momentum of this rainfall? Are these expressions describing the rainfall correct/significant?

An element of mass $Delta m_r$ (mass of rainfall) falls vertically onto a mass $m_c$ (a cart). The empty cart starts from rest and there is no friction....

Asked on 02/01/2021 by Renzo M-Svartz

1 answer

The objects that the $(frac{1}{2}, frac{1}{2})$ representation of the Lorentz group act on

In the Physics from Symmetry book (pg. 80-83), the author uses the convention of dotted and undotted spinor indices such that the $(frac{1}{2},frac{1}{2})$ representation of the...

Asked on 02/01/2021

0 answer

How do photons affect each other gravitationally?

Photons are energy. According to general relativity they should bend space.Assuming two photons pass one another in a large void of empty space how would they gravitationaly affect...

Asked on 02/01/2021

4 answer

Is the QFT vacuum $T$-invariant?

A quantum vacuum corresponds to closed loops of particle-antiparticle pairs, in the language of Feynman diagrams. There is no relation between $E$ and $p$ for...

Asked on 02/01/2021

1 answer

Friction or not?

Say I have a differential equation in $mathbb{R}^n$, Newtons Equation : begin{align} frac{dgamma(t)}{dt}=&dot{gamma}(t), nonumber frac{ddot{gamma}(t)}{dt}=&-nabla...

Asked on 02/01/2021 by flyingbirds

1 answer

Why does liquid oxygen gets suspended between magnet?

I watched a video in which liquid oxygen when passed through the poles of the magnet gets suspended or rather sticks to it. It says it is due to diamagnetic...

Asked on 02/01/2021 by user272922

2 answer

Is the Joule Thomson coefficient constant

The Joule Thomson coefficient for various gases can be found in textbooks, e.g. have I found that hydrogen has $mu_{jt}=-0,024735$ K/bar and an inversiontemperatur of around 200 K. Not...

Asked on 02/01/2021 by Irenaius

2 answer

How many dry ice produced by a 5lb co2 cylinder at 860 psi and room temperature (30 C)?

just wonder how many lb dry ice could be produced from $5$ lb $CO_2$ cylinder at $860$ psi and $30$ C , assuming no recyle co2...

Asked on 02/01/2021 by Daniel Setyadi

0 answer

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