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Physics : Recent Questions and Answers (Page 288)

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

Where does the center of mass of black hole lies?

We know that each and every object in the universe which is having mass has center of mass, but while reading about a black hole we know(a general hypothesis is)that...

Asked on 06/03/2021 by bhaskar achalla

0 answer

Transition dipole moment integral relation to probabilities derivation

I want to learn about selection rules and so have to understand transition dipole moment.Here is a nice text on it: https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Book%3A_Quantum_States_of_Atoms_and_Molecules_(Zielinksi_et_al)/04%3A_Electronic_Spectroscopy_of_Cyanine_Dyes/4.05%3A_The_Transition_Dipole_Moment_and_Spectroscopic_Selection_Rules However it cops out...

Asked on 06/03/2021

0 answer

Why is uranium's atomic weight listed as 238.02891, higher than almost all known isotopes?

The vast majority of uranium is U-238, and most of the rest is U-235, U-232, U-234, etc.... So how can the averaged atomic weight be a little over 238?...

Asked on 06/03/2021

1 answer

Tensor transformation Formula Proof

Ok so basically I am trying to prove that the following expression: Can be written using matrices like this: ...

Asked on 06/03/2021 by stefan .gkotsis

1 answer

Equivalents definitions of string field

One can define the Tachyon field in SFT via State-Operator correspondence by $Phi(0)|0rangle = c(0)e^{ikX(0)}|0rangle = c_1|0;krangle$ with $|0;krangle = e^{ikX(0)}|0rangle$. I'm trying to realize how to construct...

Asked on 06/03/2021

1 answer

A photon scatters an electron at an angle... Does it imply electron having an area greater then the photon's?

Even we don't know much about scattering areas of photons and electrons does the fact that a photon scattering an electron at an angle mean that the photon cross-section area...

Asked on 06/03/2021

2 answer

Are there differences in notation for the d'Alembert operator?

On Wikipedia the d'Alembert operator is defined as$$square = partial ^alpha partial_alpha = frac{1}{c^2} frac{partial^2}{partial t^2}-nabla^2 $$However, my professor uses the notation:$$ square = partial...

Asked on 06/03/2021 by Alessio Popovic

2 answer

Waves on water generated by a falling object

Let an object of mass $m$ and volume $V$ be dropped in water from height $h$, and $a$ be the amplitude of the wave generated. What...

Asked on 06/03/2021 by Santosh Linkha

3 answer

Flow of water and flow of electrons, how this analogy works?

If flow of electrons analogy can be imagined as flow of water, how to imagine electricity, that comes in this whole picture? When plug from bottom of sink is taken...

Asked on 06/03/2021 by Deele

2 answer

Simple doubt regarding the GNS representation

I should start by saying that I am not a physicist, and I am not really familiar with Quantum dynamics. I am reading about the GNS representation in the ...

Asked on 06/03/2021

3 answer

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