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Physics : Recent Questions and Answers (Page 187)

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

How to calculate the brightness of an object in space dependent on its distance from earth?

If a comet appears increasingly brighter as it approaches the earth, how many times brighter will it appear as it moves from $25AU$ to $5AU$ from us?...

Asked on 07/13/2021 by user784696

2 answer

Lagrangian density for a complex scalar field

I am taking a course on classical field theory, and am not entirely sure as to what motivates the for of the Lagrangian density for a complex scalar field. In...

Asked on 07/13/2021

0 answer

Why is a symmetric traceless tensor zero when averaged over all directions?

In page 168 in Ref. [1], the authors search for a suitable order parameter for the nematic phase in liquid crystal. If $vec v^alpha$ is the direction of a...

Asked on 07/13/2021 by KvanteKaffe

4 answer

Why can it be important to engineer band alignments/offsets (e.g. CdS buffer layer in CIGS)?

I would like to ask this question by the example of the CdS buffer layer in CIGS solar cells. One paper (https://pubs.rsc.org/en/content/articlelanding/2017/se/c7se00348j#!divAbstract) says that CdS is deployed,...

Asked on 07/13/2021

1 answer

Equation of motion - choosing directions for the coordinate axis

I'm not sure this equation is the right one if we invert the direction of the positive $y$-axis. Am I right if we assume the positive direction of the...

Asked on 07/13/2021 by Jyotishraj Thoudam

3 answer

Why for the closed string we need to take both left and right moving modes into account when deriving the mass?

In the closed bosonic string we have both left and right moving sectors with modes $alpha_m^mu$ and $tilde{alpha}_m^mu$ respectively where $min mathbb{Z}$ and where we have ...

Asked on 07/13/2021

1 answer

Force caused by pressure

I would like to get one thing straight in my mind: If I fill a balloon let's say with 10 bar of air. Is there a formula that relates the...

Asked on 07/13/2021

1 answer

Is self-propulsion in Leidenfrost drops placed carefully on a highly heated solid surface possible?

As is familiar to anyone who has inadvertently spilt a few drops of water onto a highly heated pan, rather than boiling away in a flash the water gathers itself...

Asked on 07/13/2021 by omegadot

1 answer

Questions on parity transformation

Is a parity transformation$$(?,?,?) → (−?,?,?)$$ or $$(?,?,?) → (−?,−?,−?)$$ Which coordinates cancel out momentum? $(?,?,?)$ (clockwise directions) and $(−?,?,?)$ (counterclockwise directions) or $(?,?,?)$...

Asked on 07/13/2021 by user279310

1 answer

In quantum field theory with a mass gap, why do states in the asymptotic future/past turn out to have a Fock space structure?

In quantum field theory with a mass gap, why do states in the asymptotic future/past turn out to have a Fock space structure? For a free quantum field theory, that's...

Asked on 07/13/2021 by Lawrence Christos

1 answer

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